Separating out Rails2 actionpack integration logic

Rails3 has different internal implementations on ActionPack which is causing breakage when trying to calculate image_paths. Lets only calculate this logic for Rails 2 at the moment, and figure out what to do with Rails3 later

lib/compass/app_integration/rails/runtime.rb

@@ -1,8 +1,12 @@
 unless defined?(Compass::RAILS_LOADED)
   Compass::RAILS_LOADED = true
   
+  if ActionPack::VERSION::MAJOR >= 3
+    # figure something out so image_path works with rails integration
+  else
     %w(action_controller sass_plugin urls).each do |lib|
-    require "compass/app_integration/rails/#{lib}"
+      require "compass/app_integration/rails/actionpack2/#{lib}"
+    end
   end
   
   # Wierd that this has to be re-included to pick up sub-modules. Ruby bug?