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

@@ -1,10 +1,14 @@
 unless defined?(Compass::RAILS_LOADED)
   Compass::RAILS_LOADED = true
-
-  %w(action_controller sass_plugin urls).each do |lib|
-    require "compass/app_integration/rails/#{lib}"
+  
+  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/actionpack2/#{lib}"
+    end
   end
-
+  
   # Wierd that this has to be re-included to pick up sub-modules. Ruby bug?
   class Sass::Script::Functions::EvaluationContext
     include Sass::Script::Functions