title: From Rails devise auth to backbone & api?
body: <p>i want to rebuild an app which is a typical rails 3.2 mvc app into a API + Frontend (Backbone) only. As I have no experience in building APIs in rails including authenticatin:</p>
  
  <ul>
  <li>What's the best way to authenticate with devise using backbone? Using auth_tokens?</li>
  <li>How should I make he API? Just printing out JSON or use a gem like Grape?</li>
  </ul>
  
  <p>thanks in advance!</p>