Implement Cross-Origin Resource Sharing:

* Add Api::ApplicationController
* Route OPTION requests (CORS preflight) to API application controller
* Filter all API requests through #cor_filter in API application
  controller

config/routes.rb

@@ -3,6 +3,8 @@ Scube::Application.routes.draw do
     namespace :v0 do
       resources :playlists, :only => [:index]
     end
+
+    match '*all' => 'application#cor_preflight', :via => :options
   end
 
   resources :sounds, :only => [:show]