don't need coffeescript, tunemygc fails on Windows

Gemfile

@@ -28,7 +28,6 @@ gem 'snorlax'
 gem 'uservoice-ruby'
 
 # asset stuff
-gem 'coffee-rails'
 gem 'jquery-rails'
 gem 'jquery-ui-rails'
 gem 'sass-rails'

Gemfile.lock

@@ -70,13 +70,6 @@ GEM
     cocaine (0.5.8)
       climate_control (>= 0.0.3, < 1.0)
     coderay (1.1.1)
-    coffee-rails (4.2.1)
-      coffee-script (>= 2.2.0)
-      railties (>= 4.0.0, < 5.2.x)
-    coffee-script (2.4.1)
-      coffee-script-source
-      execjs
-    coffee-script-source (1.10.0)
     concurrent-ruby (1.0.2)
     debug_inspector (0.0.2)
     delayed_job (4.1.2)
@@ -282,7 +275,6 @@ DEPENDENCIES
   better_errors
   binding_of_caller
   brakeman
-  coffee-rails
   delayed_job
   delayed_job_active_record
   devise
@@ -321,4 +313,4 @@ RUBY VERSION
    ruby 2.3.0p0
 
 BUNDLED WITH
-   1.13.2
+   1.13.3