diff --git a/README.md b/README.md
index 61866dc9..e7cc690d 100644
--- a/README.md
+++ b/README.md
@@ -48,11 +48,7 @@ A full set of in-depth instructional guides are available on the official websit
 
   http://middlemanapp.com/
 
-The community maintains its own collection of tips and tricks in the GitHub wiki:
-
-  https://github.com/middleman/middleman/wiki
-
-Finally, up-to-date generated code documentation is available on RubyDoc: 
+Additionally, up-to-date generated code documentation is available on RubyDoc: 
 http://rubydoc.info/github/middleman/middleman
 
 # Community
diff --git a/Rakefile b/Rakefile
index 630c02ff..1801ea15 100644
--- a/Rakefile
+++ b/Rakefile
@@ -87,6 +87,13 @@ task :test do
   end
 end
 
+desc "Run specs for all middleman gems"
+task :spec do
+  GEM_PATHS.each do |g|
+    sh "cd #{File.join(ROOT, g)} && #{Gem.ruby} -S rake spec"
+  end
+end
+
 # desc "Rune cane for all middleman gems"
 # task :cane do
 #   GEM_PATHS.each do |g|
@@ -95,4 +102,4 @@ end
 # end
 
 desc "Run tests for all middleman gems"
-task :default => :test
\ No newline at end of file
+task :default => :test
diff --git a/middleman-core/lib/middleman-core/cli/build.rb b/middleman-core/lib/middleman-core/cli/build.rb
index 608f450e..5f6fc1c3 100644
--- a/middleman-core/lib/middleman-core/cli/build.rb
+++ b/middleman-core/lib/middleman-core/cli/build.rb
@@ -233,7 +233,7 @@ module Middleman::Cli
 
       paths = ::Middleman::Util.all_files_under(@destination)
       @cleaning_queue += paths.select do |path|
-        !path.to_s.match(/\/\./) || path.to_s.match(/\.htaccess|\.htpasswd/)
+        path.to_s !~ /\/\./ || path.to_s =~ /\.(htaccess|htpasswd)/
       end
     end
 
diff --git a/middleman-core/lib/middleman-core/core_extensions/data.rb b/middleman-core/lib/middleman-core/core_extensions/data.rb
index bc2778af..026e884f 100644
--- a/middleman-core/lib/middleman-core/core_extensions/data.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/data.rb
@@ -24,12 +24,12 @@ module Middleman
         # Setup data files before anything else so they are available when
         # parsing config.rb
         def initialize
-          files.changed DataStore.matcher do |file|
-            data.touch_file(file) if file.match(%r{^#{config[:data_dir]}\/})
+          self.files.changed DataStore.matcher do |file|
+            self.data.touch_file(file) if file.start_with?("#{config[data_dir]}/")
           end
 
-          files.deleted DataStore.matcher do |file|
-            data.remove_file(file) if file.match(%r{^#{config[data_dir]}\/})
+          self.files.deleted DataStore.matcher do |file|
+            self.data.remove_file(file) if file.start_with?("#{config[data_dir]}/")
           end
 
           super
diff --git a/middleman-core/lib/middleman-core/core_extensions/file_watcher.rb b/middleman-core/lib/middleman-core/core_extensions/file_watcher.rb
index 075010af..60b368a9 100644
--- a/middleman-core/lib/middleman-core/core_extensions/file_watcher.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/file_watcher.rb
@@ -145,7 +145,8 @@ module Middleman
         # @param [Pathname] path
         # @return [Boolean]
         def ignored?(path)
-          IGNORE_LIST.any? { |r| path.to_s.match(r) }
+          path = path.to_s
+          IGNORE_LIST.any? { |r| path =~ r }
         end
 
         # Notify callbacks for a file given an array of callbacks
diff --git a/middleman-core/lib/middleman-core/core_extensions/front_matter.rb b/middleman-core/lib/middleman-core/core_extensions/front_matter.rb
index d4cd009e..747302d7 100644
--- a/middleman-core/lib/middleman-core/core_extensions/front_matter.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/front_matter.rb
@@ -1,4 +1,5 @@
 require "active_support/core_ext/hash/keys"
+require 'pathname'
 
 # Extensions namespace
 module Middleman::CoreExtensions
@@ -130,7 +131,12 @@ module Middleman::CoreExtensions
       # @param [String] path
       # @return [Array<Thor::CoreExt::HashWithIndifferentAccess, String>]
       def frontmatter_and_content(path)
-        full_path = File.expand_path(File.join(@app.source_dir, path))
+        full_path = if Pathname(path).relative?
+          File.join(@app.source_dir, path)
+        else
+          path
+        end
+        
         data = {}
         content = nil
 
@@ -158,7 +164,7 @@ module Middleman::CoreExtensions
       end
 
       def normalize_path(path)
-        path.sub(@app.source_dir, "").sub(/^\//, "")
+        path.sub(%r{^#{@app.source_dir}\/}, "")
       end
 
       # Update the main sitemap resource list
diff --git a/middleman-core/lib/middleman-core/core_extensions/rendering.rb b/middleman-core/lib/middleman-core/core_extensions/rendering.rb
index 7962afe2..aaca0be6 100644
--- a/middleman-core/lib/middleman-core/core_extensions/rendering.rb
+++ b/middleman-core/lib/middleman-core/core_extensions/rendering.rb
@@ -246,15 +246,26 @@ module Middleman
           options = opts.merge(options_for_ext(extension))
           options[:outvar] ||= '@_out_buf'
 
+          template_class = Tilt[path]
+          # Allow hooks to manipulate the template before render
+          self.class.callbacks_for_hook(:before_render).each do |callback|
+            newbody = callback.call(body, path, locs, template_class)
+            body = newbody if newbody # Allow the callback to return nil to skip it
+          end
+
           # Read compiled template from disk or cache
           template = cache.fetch(:compiled_template, options, body) do
             ::Tilt.new(path, 1, options) { body }
           end
 
           # Render using Tilt
-          run_hook :before_render, template.data, template
-          content = template.render(context, locs, &block)
-          run_hook :after_render, content, template
+          content = template.render(context, path, locs, &block)
+
+          # Allow hooks to manipulate the result after render
+          self.class.callbacks_for_hook(:after_render).each do |callback|
+            content = callback.call(content, locs, template_class)
+          end
+
           return content
         ensure
           # Reset stored buffer
@@ -408,7 +419,7 @@ module Middleman
           # Find the path by searching or using the cache
           request_path = request_path.to_s
           cache.fetch(:resolve_template, request_path, options) do
-            relative_path = request_path.sub(%r{^/}, "")
+            relative_path = Util.strip_leading_slash(request_path)
             on_disk_path  = File.expand_path(relative_path, self.source_dir)
 
             # By default, any engine will do
diff --git a/middleman-core/lib/middleman-core/preview_server.rb b/middleman-core/lib/middleman-core/preview_server.rb
index b78b8761..41833415 100644
--- a/middleman-core/lib/middleman-core/preview_server.rb
+++ b/middleman-core/lib/middleman-core/preview_server.rb
@@ -194,7 +194,7 @@ module Middleman
 
         paths.any? do |path|
           match_against.any? do |matcher|
-            path.match(matcher)
+            path =~ matcher
           end
         end
       end
diff --git a/middleman-core/lib/middleman-core/sitemap.rb b/middleman-core/lib/middleman-core/sitemap.rb
index 341c1fd9..d3392f68 100644
--- a/middleman-core/lib/middleman-core/sitemap.rb
+++ b/middleman-core/lib/middleman-core/sitemap.rb
@@ -25,18 +25,18 @@ module Middleman
         # Setup callbacks which can exclude paths from the sitemap
         app.config.define_setting :ignored_sitemap_matchers, {
           # dotfiles and folders in the root
-          :root_dotfiles => proc { |file| file.match(%r{^\.}) },
+          :root_dotfiles => proc { |file| file.start_with?('.') },
 
           # Files starting with an dot, but not .htaccess
           :source_dotfiles => proc { |file|
-            file.match(%r{/\.}) && !file.match(%r{/\.htaccess|\.htpasswd})
+            file =~ %r{/\.} && file !~ %r{/\.(htaccess|htpasswd)}
           },
 
           # Files starting with an underscore, but not a double-underscore
-          :partials => proc { |file| file.match(%r{/_}) && !file.match(%r{/__}) },
+          :partials => proc { |file| file =~ %r{/_} && file !~ %r{/__} },
 
           :layout => proc { |file|
-            file.match(%r{^source/layout\.}) || file.match(%r{^source/layouts/})
+            file.start_with?('source/layout.') || file.start_with?('source/layouts/')
           }
         }, 'Callbacks that can exclude paths from the sitemap'
 
diff --git a/middleman-core/lib/middleman-core/sitemap/store.rb b/middleman-core/lib/middleman-core/sitemap/store.rb
index a3dbc13a..5e3f3ea5 100644
--- a/middleman-core/lib/middleman-core/sitemap/store.rb
+++ b/middleman-core/lib/middleman-core/sitemap/store.rb
@@ -111,7 +111,7 @@ module Middleman
         blank_metadata = { :options => {}, :locals => {}, :page => {}, :blocks => [] }
 
         provides_metadata.inject(blank_metadata) do |result, (callback, matcher)|
-          next result if !matcher.nil? && !source_file.match(matcher)
+          next result if matcher && !source_file.match(matcher)
 
           metadata = callback.call(source_file)
 
@@ -149,9 +149,9 @@ module Middleman
         @_cached_metadata[request_path] = provides_metadata_for_path.inject(blank_metadata) do |result, (callback, matcher)|
           case matcher
           when Regexp
-            next result unless request_path.match(matcher)
+            next result unless request_path =~ matcher
           when String
-            next result unless File.fnmatch("/" + matcher.sub(%r{^/}, ''), "/#{request_path}")
+            next result unless File.fnmatch("/" + Util.strip_leading_slash(matcher), "/#{request_path}")
           end
 
           metadata = callback.call(request_path)
diff --git a/middleman-core/lib/middleman-core/util.rb b/middleman-core/lib/middleman-core/util.rb
index fba225ec..4328341e 100644
--- a/middleman-core/lib/middleman-core/util.rb
+++ b/middleman-core/lib/middleman-core/util.rb
@@ -10,7 +10,8 @@ require "thor"
 # Core Pathname library used for traversal
 require "pathname"
 
-require "rack"
+require "tilt"
+require "rack/mime"
 
 module Middleman
 
@@ -22,11 +23,19 @@ module Middleman
     # @return [Boolean]
     def self.binary?(filename)
       ext = File.extname(filename)
+      return true if ext == '.svgz'
       return false if Tilt.registered?(ext.sub('.',''))
 
       ext = ".#{ext}" unless ext.to_s[0] == ?.
       mime = ::Rack::Mime.mime_type(ext, nil) 
-      return false unless mime
+      unless mime
+        binary_bytes = [0, 1, 2, 3, 4, 5, 6, 11, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31]
+        s = File.read(filename, 4096) || ''        
+        s.each_byte do |c|
+          return true if binary_bytes.include?(c)          
+        end
+        return false
+      end
       return false if mime.start_with?('text/')
       return false if mime.include?('xml')
       return false if mime.include?('json')
@@ -78,7 +87,13 @@ module Middleman
     # @return [String]
     def self.normalize_path(path)
       # The tr call works around a bug in Ruby's Unicode handling
-      path.sub(/^\//, "").tr('','')
+      path.sub(%r{^/}, "").tr('','')
+    end
+
+    # This is a separate method from normalize_path in case we
+    # change how we normalize paths
+    def self.strip_leading_slash(path)
+      path.sub(%r{^/}, "")
     end
 
     # Extract the text of a Rack response as a string.
diff --git a/middleman-core/middleman-core.gemspec b/middleman-core/middleman-core.gemspec
index 643e79de..506f7137 100644
--- a/middleman-core/middleman-core.gemspec
+++ b/middleman-core/middleman-core.gemspec
@@ -26,7 +26,7 @@ Gem::Specification.new do |s|
   s.add_dependency("rack-test", ["~> 0.6.1"])
   
   # CLI
-  s.add_dependency("thor", [">= 0.15.4", "~> 0.15"])
+  s.add_dependency("thor", ["~> 0.15.4"])
   
   # Helpers
   s.add_dependency("activesupport", ["~> 3.2.6"])
diff --git a/middleman-core/spec/middleman-core/binary_spec.rb b/middleman-core/spec/middleman-core/binary_spec.rb
new file mode 100644
index 00000000..ad04efb7
--- /dev/null
+++ b/middleman-core/spec/middleman-core/binary_spec.rb
@@ -0,0 +1,15 @@
+require 'middleman-core/util'
+
+describe "Middleman::Util#binary?" do
+  %w(plain.txt unicode.txt unicode stars.svgz).each do |file|
+    it "recognizes #{file} as not binary" do
+      Middleman::Util.binary?(File.join(File.dirname(__FILE__), "binary_spec/#{file}")).should be_false
+    end
+  end
+
+  %w(middleman.png middleman).each do |file|
+    it "recognizes #{file} as binary" do
+      Middleman::Util.binary?(File.join(File.dirname(__FILE__), "binary_spec/#{file}")).should be_true
+    end
+  end
+end
diff --git a/middleman-core/spec/middleman-core/binary_spec/middleman b/middleman-core/spec/middleman-core/binary_spec/middleman
new file mode 100644
index 00000000..c685e564
Binary files /dev/null and b/middleman-core/spec/middleman-core/binary_spec/middleman differ
diff --git a/middleman-core/spec/middleman-core/binary_spec/middleman.png b/middleman-core/spec/middleman-core/binary_spec/middleman.png
new file mode 100644
index 00000000..c685e564
Binary files /dev/null and b/middleman-core/spec/middleman-core/binary_spec/middleman.png differ
diff --git a/middleman-core/spec/middleman-core/binary_spec/plain.txt b/middleman-core/spec/middleman-core/binary_spec/plain.txt
new file mode 100644
index 00000000..649adbeb
--- /dev/null
+++ b/middleman-core/spec/middleman-core/binary_spec/plain.txt
@@ -0,0 +1 @@
+Some plain text
diff --git a/middleman-core/spec/middleman-core/binary_spec/stars.svgz b/middleman-core/spec/middleman-core/binary_spec/stars.svgz
new file mode 100644
index 00000000..a54ce7ff
Binary files /dev/null and b/middleman-core/spec/middleman-core/binary_spec/stars.svgz differ
diff --git a/middleman-core/spec/middleman-core/binary_spec/unicode b/middleman-core/spec/middleman-core/binary_spec/unicode
new file mode 100644
index 00000000..13dc1361
--- /dev/null
+++ b/middleman-core/spec/middleman-core/binary_spec/unicode
@@ -0,0 +1 @@
+明日がある。
diff --git a/middleman-core/spec/middleman-core/binary_spec/unicode.txt b/middleman-core/spec/middleman-core/binary_spec/unicode.txt
new file mode 100644
index 00000000..13dc1361
--- /dev/null
+++ b/middleman-core/spec/middleman-core/binary_spec/unicode.txt
@@ -0,0 +1 @@
+明日がある。
diff --git a/middleman-more/features/cache_buster.feature b/middleman-more/features/cache_buster.feature
index 7c094f7f..11040ba5 100644
--- a/middleman-more/features/cache_buster.feature
+++ b/middleman-more/features/cache_buster.feature
@@ -25,3 +25,18 @@ Feature: Generate mtime-based query string for busting browser caches
     When I go to "/cache-buster.html"
     Then I should see "site.css?"
     Then I should see "blank.gif?"
+
+  Scenario: Rendering css with the feature and relative_assets enabled
+    Given "relative_assets" feature is "enabled"
+    Given "cache_buster" feature is "enabled"
+    And the Server is running at "cache-buster-app"
+    When I go to "/stylesheets/relative_assets.css"
+    Then I should see "blank.gif?"
+
+  Scenario: Rendering html with the feature and relative_assets enabled
+    Given "relative_assets" feature is "enabled"
+    Given "cache_buster" feature is "enabled"
+    And the Server is running at "cache-buster-app"
+    When I go to "/cache-buster.html"
+    Then I should see "site.css?"
+    Then I should see "blank.gif?"
\ No newline at end of file
diff --git a/middleman-more/features/helpers_form_tag.feature b/middleman-more/features/helpers_form_tag.feature
new file mode 100644
index 00000000..643ca18a
--- /dev/null
+++ b/middleman-more/features/helpers_form_tag.feature
@@ -0,0 +1,26 @@
+Feature: form_tag helper
+
+  Scenario: form_tag produces relative links
+    Given a fixture app "indexable-app"
+    And an empty file named "config.rb"
+    And a file named "source/form_tag.html.erb" with:
+    """
+    absolute: <% form_tag "/needs_index.html#absolute", :relative => true do %>
+    <% end %>
+    relative: <% form_tag "needs_index.html#relative", :relative => true do %>
+    <% end %>
+    """
+    And a file named "source/form_tag/sub.html.erb" with:
+    """
+    absolute: <% form_tag "/needs_index.html#absolute", :relative => true do %>
+    <% end %>
+    relative: <% form_tag "../needs_index.html#relative", :relative => true do %>
+    <% end %>
+    """
+    And the Server is running at "indexable-app"
+    When I go to "/form_tag.html"
+    Then I should see 'action="needs_index.html#absolute"'
+    Then I should see 'action="needs_index.html#relative"'
+    When I go to "/form_tag/sub.html"
+    Then I should see 'action="../needs_index.html#absolute"'
+    Then I should see 'action="../needs_index.html#relative"'
diff --git a/middleman-more/features/helpers_url_for.feature b/middleman-more/features/helpers_url_for.feature
new file mode 100644
index 00000000..c2b5a5a8
--- /dev/null
+++ b/middleman-more/features/helpers_url_for.feature
@@ -0,0 +1,152 @@
+Feature: url_for helper
+
+  Scenario: url_for produces relative links
+    Given a fixture app "indexable-app"
+    And an empty file named "config.rb"
+    And a file named "source/url_for.html.erb" with:
+    """
+    absolute: <%= url_for "/needs_index.html", :relative => true %>
+    relative: <%= url_for "needs_index.html", :relative => true %>
+    """
+    And a file named "source/url_for/sub.html.erb" with:
+    """
+    absolute: <%= url_for "/needs_index.html", :relative => true %>
+    relative: <%= url_for "../needs_index.html", :relative => true %>
+    """
+    And the Server is running at "indexable-app"
+    When I go to "/url_for.html"
+    Then I should see 'absolute: needs_index.html'
+    Then I should see 'relative: needs_index.html'
+    When I go to "/url_for/sub.html"
+    Then I should see 'absolute: ../needs_index.html'
+    Then I should see 'relative: ../needs_index.html'
+
+  Scenario: url_for relative works with strip_index_file
+    Given a fixture app "indexable-app"
+    And a file named "config.rb" with:
+    """
+    set :relative_links, true
+    set :strip_index_file, true
+    helpers do
+      def menu_items(path='url_for.html')
+        sitemap.find_resource_by_destination_path(path).children
+      end
+    end
+    """
+    And a file named "source/url_for.html.erb" with:
+    """
+    <% menu_items.each do |item| %>
+        "<%= url_for(item.url) %>"
+        "<%= url_for(item) %>"
+    <% end %>
+    """
+    And a file named "source/url_for/sub.html.erb" with:
+    """
+    <% menu_items.each do |item| %>
+        "<%= url_for(item.url) %>"
+        "<%= url_for(item) %>"
+    <% end %>
+    """
+    And the Server is running at "indexable-app"
+    When I go to "/url_for.html"
+    Then I should see '"url_for/sub.html"'
+    Then I should not see "/url_for/sub.html"
+    When I go to "/url_for/sub.html"
+    Then I should see '"sub.html"'
+    Then I should not see "/url_for/sub.html"
+
+  Scenario: url_for produces relative links when :relative_links is set to true
+    Given a fixture app "indexable-app"
+    And a file named "config.rb" with:
+    """
+    set :relative_links, true
+    """
+    And a file named "source/url_for.html.erb" with:
+    """
+    absolute: <%= url_for "/needs_index.html" %>
+    relative: <%= url_for "needs_index.html", :relative => false %>
+    unknown: <%= url_for "foo.html" %>
+    """
+    And a file named "source/url_for/sub.html.erb" with:
+    """
+    absolute: <%= url_for "/needs_index.html" %>
+    relative: <%= url_for "../needs_index.html" %>
+    """
+    And the Server is running at "indexable-app"
+    When I go to "/url_for.html"
+    Then I should see 'absolute: needs_index.html'
+    Then I should see 'relative: /needs_index.html'
+    Then I should see 'unknown: foo.html'
+    When I go to "/url_for/sub.html"
+    Then I should see 'absolute: ../needs_index.html'
+    Then I should see 'relative: ../needs_index.html'
+  
+  Scenario: url_for knows about directory indexes
+    Given a fixture app "indexable-app"
+    And a file named "source/url_for.html.erb" with:
+    """
+    absolute: <%= url_for "/needs_index.html", :relative => true %>
+    relative: <%= url_for "needs_index.html", :relative => true %>
+    """
+    And a file named "source/url_for/sub.html.erb" with:
+    """
+    absolute: <%= url_for "/needs_index.html", :relative => true %>
+    relative: <%= url_for "../needs_index.html", :relative => true %>
+    """
+    And the Server is running at "indexable-app"
+    When I go to "/url_for/"
+    Then I should see 'absolute: ../needs_index/'
+    Then I should see 'relative: ../needs_index/'
+    When I go to "/url_for/sub/"
+    Then I should see 'absolute: ../../needs_index/'
+    Then I should see 'relative: ../../needs_index/'
+
+  Scenario: url_for can take a Resource
+    Given a fixture app "indexable-app"
+    And a file named "source/url_for.html.erb" with:
+    """
+    "<%= url_for sitemap.find_resource_by_path("/needs_index.html") %>"
+    """
+    And the Server is running at "indexable-app"
+    When I go to "/url_for/"
+    Then I should see '"/needs_index/"'
+
+  Scenario: Setting http_prefix
+    Given a fixture app "indexable-app"
+    And a file named "config.rb" with:
+    """
+    set :http_prefix, "/foo"
+    """
+    And a file named "source/url_for.html.erb" with:
+    """
+    <%= url_for "/needs_index.html" %>
+    """
+    And the Server is running at "indexable-app"
+    When I go to "/url_for.html"
+    Then I should see '/foo/needs_index.html'
+
+  Scenario: url_for preserves query string and anchor and isn't messed up by them
+    Given a fixture app "indexable-app"
+    And a file named "source/url_for.html.erb" with:
+    """
+    Needs Index Anchor <%= url_for "/needs_index.html#foo" %>
+    Needs Index Query <%= url_for "/needs_index.html?foo" %>
+    Needs Index Query and Anchor <%= url_for "/needs_index.html?foo#foo" %>
+    """
+    And the Server is running at "indexable-app"
+    When I go to "/url_for/"
+    Then I should see 'Needs Index Anchor /needs_index/#foo'
+    Then I should see 'Needs Index Query /needs_index/?foo'
+    Then I should see 'Needs Index Query and Anchor /needs_index/?foo#foo'
+
+  Scenario: url_for accepts a :query option that appends a query string
+    Given a fixture app "indexable-app"
+    And a file named "source/url_for.html.erb" with:
+    """
+    Needs Index String <%= url_for "/needs_index.html", :query => "foo" %>
+    Needs Index Hash <%= url_for "/needs_index.html", :query => { :foo => :bar } %>
+    """
+    And the Server is running at "indexable-app"
+    When I go to "/url_for/"
+    Then I should see 'Needs Index String /needs_index/?foo'
+    Then I should see 'Needs Index Hash /needs_index/?foo=bar'
diff --git a/middleman-more/features/i18n_preview.feature b/middleman-more/features/i18n_preview.feature
index 81360e23..bfc591ef 100644
--- a/middleman-more/features/i18n_preview.feature
+++ b/middleman-more/features/i18n_preview.feature
@@ -103,6 +103,51 @@ Feature: i18n Preview
     Then I should see "Como Esta?"
     When I go to "/spanish/hola.html"
     Then I should see "Hola World"
+
+  Scenario: Running localize with a non-English mount config
+    Given a fixture app "i18n-test-app"
+    And a file named "config.rb" with:
+      """
+      activate :i18n, :mount_at_root => :es
+      """
+    Given the Server is running at "i18n-test-app"
+    When I go to "/en/index.html"
+    Then I should see "Howdy"
+    When I go to "/en/hello.html"
+    Then I should see "Hello World"
+    When I go to "/"
+    Then I should see "Como Esta?"
+    When I go to "/hola.html"
+    Then I should see "Hola World"
+    When I go to "/hello.html"
+    Then I should see "File Not Found"
+    When I go to "/es/index.html"
+    Then I should see "File Not Found"
+    When I go to "/es/hola.html"
+    Then I should see "File Not Found"
+
+  Scenario: Running localize with a non-English lang subset
+    Given a fixture app "i18n-test-app"
+    And a file named "config.rb" with:
+      """
+      activate :i18n, :langs => :es
+      """
+    Given the Server is running at "i18n-test-app"
+    When I go to "/en/index.html"
+    Then I should see "File Not Found"
+    When I go to "/en/hello.html"
+    Then I should see "File Not Found"
+    When I go to "/"
+    Then I should see "Como Esta?"
+    When I go to "/hola.html"
+    Then I should see "Hola World"
+    When I go to "/hello.html"
+    Then I should see "File Not Found"
+    When I go to "/es/index.html"
+    Then I should see "File Not Found"
+    When I go to "/es/hola.html"
+    Then I should see "File Not Found"
+    
     
   Scenario: Running localize with the no mount config
     Given a fixture app "i18n-test-app"
diff --git a/middleman-more/lib/middleman-more/core_extensions/default_helpers.rb b/middleman-more/lib/middleman-more/core_extensions/default_helpers.rb
index 95ddae8a..ffc5c4e6 100644
--- a/middleman-more/lib/middleman-more/core_extensions/default_helpers.rb
+++ b/middleman-more/lib/middleman-more/core_extensions/default_helpers.rb
@@ -64,7 +64,7 @@ module Middleman
           # If the basename of the request as no extension, assume we are serving a
           # directory and join index_file to the path.
           path = File.join(asset_dir, current_path)
-          path = path.gsub(File.extname(path), ".#{asset_ext}")
+          path = path.sub(/#{File.extname(path)}$/, ".#{asset_ext}")
 
           yield path if sitemap.find_resource_by_path(path)
         end
@@ -74,11 +74,11 @@ module Middleman
         # @return [String]
         def page_classes
           path = current_path.dup
-          path << index_file if path.match(%r{/$})
-          path = path.gsub(%r{^/}, '')
+          path << index_file if path.end_with?('/')
+          path = Util.strip_leading_slash(path)
 
           classes = []
-          parts = path.split('.')[0].split('/')
+          parts = path.split('.').first.split('/')
           parts.each_with_index { |path, i| classes << parts.first(i+1).join('_') }
 
           classes.join(' ')
@@ -90,22 +90,93 @@ module Middleman
         # @param [String] source The path to the file
         # @return [String]
         def asset_path(kind, source)
-          return source if source =~ /^http/
+          return source if source.to_s.include?('//')
           asset_folder  = case kind
             when :css    then css_dir
             when :js     then js_dir
             when :images then images_dir
             else kind.to_s
           end
-          source = source.to_s.gsub(/\s/, '')
+          source = source.to_s.tr(' ', '')
           ignore_extension = (kind == :images) # don't append extension
-          source << ".#{kind}" unless ignore_extension or source =~ /\.#{kind}/
-          if source =~ %r{^/} # absolute path
-            asset_folder = ""
-          end
+          source << ".#{kind}" unless ignore_extension || source.end_with?(".#{kind}")
+          asset_folder = "" if source.start_with?('/') # absolute path
+
           asset_url(source, asset_folder)
         end
 
+        # Given a source path (referenced either absolutely or relatively)
+        # or a Resource, this will produce the nice URL configured for that
+        # path, respecting :relative_links, directory indexes, etc.
+        def url_for(path_or_resource, options={})
+          # Handle Resources and other things which define their own url method
+          url = path_or_resource.respond_to?(:url) ? path_or_resource.url : path_or_resource
+
+          begin
+            uri = URI(url)
+          rescue URI::InvalidURIError
+            # Nothing we can do with it, it's not really a URI
+            return url
+          end
+
+          relative = options.delete(:relative)
+          raise "Can't use the relative option with an external URL" if relative && uri.host
+
+          # Allow people to turn on relative paths for all links with 
+          # set :relative_links, true
+          # but still override on a case by case basis with the :relative parameter.
+          effective_relative = relative || false
+          effective_relative = true if relative.nil? && config[:relative_links]
+
+          # Try to find a sitemap resource corresponding to the desired path
+          this_resource = current_resource # store in a local var to save work
+          if path_or_resource.is_a?(Sitemap::Resource)
+            resource = path_or_resource 
+            resource_url = url
+          elsif this_resource && uri.path
+            # Handle relative urls
+            url_path = Pathname(uri.path)
+            current_source_dir = Pathname('/' + this_resource.path).dirname
+            url_path = current_source_dir.join(url_path) if url_path.relative?
+            resource = sitemap.find_resource_by_path(url_path.to_s)
+            resource_url = resource.url if resource
+          end
+
+          if resource
+            # Switch to the relative path between this_resource and the given resource
+            # if we've been asked to.
+            if effective_relative
+              # Output urls relative to the destination path, not the source path
+              current_dir = Pathname('/' + this_resource.destination_path).dirname
+              relative_path = Pathname(resource_url).relative_path_from(current_dir).to_s
+
+              # Put back the trailing slash to avoid unnecessary Apache redirects
+              if resource_url.end_with?('/') && !relative_path.end_with?('/')
+                relative_path << '/'
+              end
+
+              uri.path = relative_path
+            else
+              uri.path = resource_url
+            end
+          else
+            # If they explicitly asked for relative links but we can't find a resource...
+            raise "No resource exists at #{url}" if relative
+          end
+            
+          # Support a :query option that can be a string or hash
+          if query = options.delete(:query)
+            uri.query = query.respond_to?(:to_param) ? query.to_param : query.to_s
+          end
+
+          # Support a :fragment or :anchor option just like Padrino
+          fragment = options.delete(:anchor) || options.delete(:fragment)
+          uri.fragment = fragment.to_s if fragment
+          
+          # Finally make the URL back into a string
+          uri.to_s
+        end
+
         # Overload the regular link_to to be sitemap-aware - if you
         # reference a source path, either absolutely or relatively,
         # you'll get that resource's nice URL. Also, there is a
@@ -123,75 +194,27 @@ module Middleman
           url_arg_index = block_given? ? 0 : 1
           options_index = block_given? ? 1 : 2
 
+          if block_given? && args.size > 2
+            raise ArgumentError.new("Too many arguments to link_to(url, options={}, &block)")
+          end
+
           if url = args[url_arg_index]
             options = args[options_index] || {}
-            relative = options.delete(:relative)
-
-            # Handle Resources, which define their own url method
-            if url.respond_to? :url
-              url = args[url_arg_index] = url.url
-            end
-
-            if url.include? '://'
-              raise "Can't use the relative option with an external URL" if relative
-            elsif current_resource
-              # Handle relative urls
-              current_source_dir = Pathname('/' + current_resource.path).dirname
-
-              begin
-                uri = URI(url)
-                url_path = uri.path
-              rescue
-              end
-
-              if url_path
-                path = Pathname(url_path)
-                url_path = current_source_dir.join(path).to_s if path.relative?
-
-                resource = sitemap.find_resource_by_path(url_path)
-
-                # Allow people to turn on relative paths for all links with config[:relative_links] = true
-                # but still override on a case by case basis with the :relative parameter.
-                effective_relative = relative || false
-                if relative.nil? && config[:relative_links]
-                  effective_relative = true
-                end
-
-                if resource
-                  if effective_relative
-                    resource_url = resource.url
-
-                    # Output urls relative to the destination path, not the source path
-                    current_dir = Pathname('/' + current_resource.destination_path).dirname
-                    new_url = Pathname(resource_url).relative_path_from(current_dir).to_s
-
-                    # Put back the trailing slash to avoid unnecessary Apache redirects
-                    if resource_url.end_with?('/') && !new_url.end_with?('/')
-                      new_url << '/'
-                    end
-                  else
-                    new_url = resource.url
-                  end
-
-                  uri.path = new_url
-
-                  args[url_arg_index] = uri.to_s
-                else
-                  raise "No resource exists at #{url}" if relative
-                end
-              end
-            end
-
-            # Support a :query option that can be a string or hash
-            if query = options.delete(:query)
-              uri = URI(args[url_arg_index])
-              uri.query = query.respond_to?(:to_param) ? query.to_param : query.to_s
-              args[url_arg_index] = uri.to_s
-            end
+            raise ArgumentError.new("Options must be a hash") unless options.is_a?(Hash)
+            
+            # Transform the url through our magic url_for method
+            args[url_arg_index] = url_for(url, options)
           end
             
           super(*args, &block)
         end
+
+        # Modified Padrino form_for that uses Middleman's url_for
+        # to transform the URL.
+        def form_tag(url, options={}, &block)
+          url = url_for(url, options)
+          super
+        end
       end
     end
   end
diff --git a/middleman-more/lib/middleman-more/core_extensions/i18n.rb b/middleman-more/lib/middleman-more/core_extensions/i18n.rb
index 1653a384..057a0789 100644
--- a/middleman-more/lib/middleman-more/core_extensions/i18n.rb
+++ b/middleman-more/lib/middleman-more/core_extensions/i18n.rb
@@ -28,6 +28,7 @@ module Middleman
           @app = app
           @locales_glob = File.join(app.locales_dir, "**", "*.{rb,yml,yaml}")
 
+          # File.fnmatch doesn't support brackets: {rb,yml,yaml}
           regex = @locales_glob.sub(/\./, '\.').sub(File.join("**", "*"), ".*").sub(/\//, '\/').sub("{rb,yml,yaml}", "rb|ya?ml")
           @locales_regex = %r{^#{regex}}
 
@@ -43,7 +44,7 @@ module Middleman
           @mount_at_root = @options.has_key?(:mount_at_root) ? @options[:mount_at_root] : langs.first
 
           if !@app.build?
-            logger.info "== Locales: #{langs.join(", ")}"
+            logger.info "== Locales: #{langs.join(", ")} (Default #{@mount_at_root})"
           end
 
           # Don't output localizable files
@@ -52,15 +53,20 @@ module Middleman
           @app.sitemap.provides_metadata_for_path do |url|
             if d = get_localization_data(url)
               lang, page_id = d
-              instance_vars = Proc.new {
-                ::I18n.locale = lang
-                @lang         = lang
-                @page_id      = page_id
-              }
-              { :blocks => [instance_vars] }
             else
-              {}
+              # Default to the @mount_at_root lang
+              page_id = nil
+              lang = @mount_at_root
             end
+
+            instance_vars = Proc.new do
+              ::I18n.locale = lang
+              @lang         = lang
+              @page_id      = page_id
+            end
+
+            locals = { :lang => lang, :page_id => page_id }
+            { :blocks => [instance_vars], :locals => locals }
           end
 
           @app.sitemap.register_resource_list_manipulator(
@@ -73,13 +79,15 @@ module Middleman
         end
 
         def on_file_changed(file)
-          if @locales_regex.match(file)
+          if @locales_regex =~ file
             ::I18n.reload!
           end
         end
 
         def langs
-          @options[:langs] || begin
+          if @options[:langs]
+            Array(@options[:langs]).map(&:to_sym)
+          else
             Dir[File.join(@app.root, @locales_glob)].map { |file|
               File.basename(file).sub(/\.ya?ml$/, "").sub(/\.rb$/, "")
             }.sort.map(&:to_sym)
diff --git a/middleman-more/lib/middleman-more/extensions/automatic_image_sizes.rb b/middleman-more/lib/middleman-more/extensions/automatic_image_sizes.rb
index 00f48e03..da7e5a39 100644
--- a/middleman-more/lib/middleman-more/extensions/automatic_image_sizes.rb
+++ b/middleman-more/lib/middleman-more/extensions/automatic_image_sizes.rb
@@ -38,7 +38,7 @@ module Middleman
             params[:alt] ||= ""
 
             real_path = path
-            real_path = File.join(images_dir, real_path) unless real_path =~ %r{^/}
+            real_path = File.join(images_dir, real_path) unless real_path.start_with?('/')
             full_path = File.join(source_dir, real_path)
 
             if File.exists?(full_path)
diff --git a/middleman-more/lib/middleman-more/extensions/relative_assets.rb b/middleman-more/lib/middleman-more/extensions/relative_assets.rb
index 7e457cd4..0bb0a777 100644
--- a/middleman-more/lib/middleman-more/extensions/relative_assets.rb
+++ b/middleman-more/lib/middleman-more/extensions/relative_assets.rb
@@ -36,7 +36,7 @@ module Middleman
             path
           else
             current_dir = Pathname('/' + current_resource.destination_path)
-            Pathname(path).relative_path_from(current_dir.dirname)
+            Pathname(path).relative_path_from(current_dir.dirname).to_s
           end
         end
       end
diff --git a/vendor.yml b/vendor.yml
new file mode 100644
index 00000000..417247e2
--- /dev/null
+++ b/vendor.yml
@@ -0,0 +1,2 @@
+- fixtures
+- templates