Remove unused coffee-rails dependency from Gemfile

Signed-off-by: Alex Coles <alex@alexbcoles.com>

Gemfile

@@ -110,7 +110,6 @@ gem 'sprockets-rails',  '2.0.0.backport1'
 gem 'sass-rails',        git: 'https://github.com/guilleiguaran/sass-rails.git', branch: 'backport'
 gem 'sass',             '~> 3.3.6'
 gem 'bourbon',          '~> 4.0'
-gem 'coffee-rails',     '~> 3.2.1'
 gem 'uglifier',         '>= 1.0.3'
 gem 'compass',          '1.0.0.alpha.19'
 gem 'compass-rails',    git: 'https://github.com/Compass/compass-rails'

Gemfile.lock

@@ -110,13 +110,6 @@ GEM
     codeclimate-test-reporter (0.1.1)
       simplecov (>= 0.7.1, < 1.0.0)
     coderay (1.0.9)
-    coffee-rails (3.2.2)
-      coffee-script (>= 2.2.0)
-      railties (~> 3.2.0)
-    coffee-script (2.2.0)
-      coffee-script-source
-      execjs
-    coffee-script-source (1.6.2)
     color-tools (1.3.0)
     columnize (0.8.9)
     compass (1.0.0.alpha.19)
@@ -393,7 +386,6 @@ DEPENDENCIES
   cocaine
   codeclimate-test-reporter
   coderay (~> 1.0.5)
-  coffee-rails (~> 3.2.1)
   color-tools (~> 1.3.0)
   compass (= 1.0.0.alpha.19)
   compass-rails!