update compass to 0.12.1 (via compass-rails 1.0.1)

gets rid of "on_updating_stylesheet" deprecation warning

Change-Id: Ibec7853e251508ad663dee78de6d190af0bee0fd
Reviewed-on: https://gerrit.instructure.com/10123
Tested-by: Hudson <hudson@instructure.com>
Reviewed-by: Simon Williams <simon@instructure.com>

Gemfile

@@ -8,7 +8,6 @@ gem 'authlogic',      '2.1.3'
 gem "aws-s3-instructure", "~> 0.6.2.1319643167",  :require => 'aws/s3'
 gem 'bcrypt-ruby',    '3.0.1'
 gem 'builder',        '2.1.2'
-gem 'compass',        '0.11.5'
 gem 'daemons',        '1.1.0'
 gem 'diff-lcs',       '1.1.2',  :require => 'diff/lcs'
 gem 'erubis',         '2.7.0'
@@ -52,6 +51,10 @@ gem 'xml-simple',     '1.0.12', :require => 'xmlsimple'
 # this is only needed by jammit, but we're pinning at 0.9.4 because 0.9.5 breaks
 gem 'yui-compressor', '0.9.4'
 
+group :assets do
+  gem 'compass-rails', '1.0.1'
+end
+
 group :mysql do
   gem 'mysql',        '2.8.1'
 end

config/initializers/compass.rb

@@ -1,5 +1 @@
-require 'compass'
-# If you have any compass plugins, require them here.
-Compass.add_project_configuration(File.join(RAILS_ROOT, "config", "compass.config"))
-Compass.configuration.environment = RAILS_ENV.to_sym
-Compass.configure_sass_plugin!
+require 'compass-rails'

lib/tasks/css.rake

@@ -1,13 +1,10 @@
-require 'compass'
-require 'compass/commands'
-
 namespace :css do
   desc "Compile css assets."
   task :generate do
     require 'config/initializers/plugin_symlinks'
-
-    # initialize compass if it hasn't been yet
-    Compass::AppIntegration::Rails.initialize! unless Compass::AppIntegration::Rails.booted?
+    require 'action_controller'
+    require 'compass-rails'
+    require 'compass/commands'
 
     # build the list of files ourselves so that we get it to follow symlinks
     sass_path = File.expand_path(Compass.configuration.sass_path)