Require action_controller before any other action_controller file

This will load properly the loading hooks.

Closes rails/sass-rails#205

railties/lib/rails/test_help.rb

@@ -4,6 +4,7 @@
 
 require 'active_support/testing/autorun'
 require 'active_support/test_case'
+require 'action_controller'
 require 'action_controller/test_case'
 require 'action_dispatch/testing/integration'
 require 'rails/generators/test_case'