Minify all JS and CSS via middleware. This means JS or CSS anywhere in the site is minified, not just in the Sprockets-controlled directories. I've also added inline CSS compression, and handling of several common "guards" that get wrapped around JS. Also, leave alone non-JS script tags (which may contain something like jQuery templates). Sprockets no longer has anything to do with minification after this.

middleman-core/lib/middleman-core/step_definitions/server_steps.rb

@@ -68,10 +68,14 @@ Then /^I should see '([^\']*)'$/ do |expected|
   @browser.last_response.body.should include(expected)
 end
 
+Then /^I should see:$/ do |expected|
+  @browser.last_response.body.should include(expected)
+end
+
 Then /^I should not see "([^\"]*)"$/ do |expected|
   @browser.last_response.body.should_not include(expected)
 end
 
 Then /^I should see "([^\"]*)" lines$/ do |lines|
   @browser.last_response.body.chomp.split($/).length.should == lines.to_i
-end
+end

middleman-core/lib/middleman-core/templates.rb

@@ -59,8 +59,9 @@ module Middleman::Templates
       return unless options[:bundler]
       template "shared/Gemfile.tt", File.join(location, "Gemfile")
       
-      say_status :run, "bundle install"
-      print `cd #{location} && "#{Gem.ruby}" -rubygems "#{Gem.bin_path('bundler', 'bundle')}" install`
+      inside(location) do
+        run('bundle install', :capture => true)
+      end
     end
   end
 end