Move all order logic to models

- Have a default order for each model
-- The overall default is ID DESC
- Allow for custom orderings
-- When comma-separated IDs are used

app/controllers/user_feedbacks_controller.rb

@@ -20,7 +20,7 @@ class UserFeedbacksController < ApplicationController
 
   def index
     @search = UserFeedback.visible.search(params[:search])
-    @user_feedbacks = @search.paginate(params[:page], :limit => params[:limit]).order("created_at desc")
+    @user_feedbacks = @search.paginate(params[:page], :limit => params[:limit])
     respond_with(@user_feedbacks) do |format|
       format.xml do
         render :xml => @user_feedbacks.to_xml(:root => "user-feedbacks")