Re-worked to easly sync with swagger-ui

 * added a rake task to sync up swagger-ui
 * expose stylesheets as separate entities (reset.css could be already included by host app)
 * expose swagger-oauth
 * added a hack to make throbber.gif available to asset pipeline
 * updated swagger-ui to latest version
Merge pull request #6 from 3scale/patch-1

Sync with swagger-ui
Sorry for the long wait