change back to module. causing problems in dev with reopen implementation

lib/impressionist/engine.rb

@@ -3,8 +3,15 @@ require "rails"
 
 module Impressionist
   class Engine < Rails::Engine    
-    initializer 'impressionist.extend_ar' do
+    initializer 'impressionist.extend_ar' do |app|
       ActiveRecord::Base.extend Impressionist::Impressionable
     end
+    
+    initializer 'impressionist.controller' do
+      ActiveSupport.on_load(:action_controller) do
+        include ImpressionistController::InstanceMethods
+        extend ImpressionistController::ClassMethods
+      end
+    end
   end
 end