in order to give plugins consistent entry points

to patch core classes, we can use ActiveSupport's
lazy load hooks. this one will allow plugins to
register callbacks when the application controller
is loaded. see the meta project plugin for a use
case.

app/controllers/application_controller.rb

@@ -598,4 +598,6 @@ class ApplicationController < ActionController::Base
     name
   end
   helper_method :default_breadcrumb
+
+  ActiveSupport.run_load_hooks(:application_controller, self)
 end