Refactored core Redmine patches so the plugin can be run in development.

app/controllers/rates_controller.rb

@@ -1,4 +1,5 @@
 class RatesController < ApplicationController
+  unloadable
   helper :users
   helper :sort
   include SortHelper

app/models/rate.rb

@@ -1,4 +1,5 @@
 class Rate < ActiveRecord::Base
+  unloadable
   class InvalidParameterException < Exception; end
 
   belongs_to :project