bump tilt requirement, unregister plaintext template. fixes #824

Gemfile

@@ -21,12 +21,12 @@ gem "less", "~> 2.2", :require => false
 gem "stylus", :require => false
 
 platforms :ruby do
-  gem "therubyracer", "0.10.2"
+  gem "therubyracer"#, "0.10.2"
   gem "redcarpet"
 end
 
 platforms :jruby do
-  gem "therubyrhino", "1.73.5"
+  gem "therubyrhino"
 end
 
 # Middleman itself

middleman-core/lib/middleman-core/core_extensions/rendering.rb

@@ -22,6 +22,8 @@ module Middleman
           app.define_hook :before_render
           app.define_hook :after_render
 
+          ::Tilt.mappings.delete('html') # WTF, Tilt?
+
           # Activate custom renderers
           require "middleman-core/renderers/erb"
           app.register Middleman::Renderers::ERb

middleman-core/middleman-core.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
   # Core
   s.add_dependency("bundler", ["~> 1.1"])
   s.add_dependency("rack", ["~> 1.4.1"])
-  s.add_dependency("tilt", ["~> 1.3.1"])
+  s.add_dependency("tilt", ["~> 1.3.6"])
   
   # Builder
   s.add_dependency("rack-test", ["~> 0.6.1"])