title: Devise + Omniauth - How to pass extra parameters along?
body: <p>I have the ability in the app to load /users/auth/facebook to connect to facebook. I want to be able to know where the request came from. Whether it was from a user who is registering with facebook, or a existing user who simply wants to connect with facebook. Based on the type, the responses are very different.</p>
  
  <p>How can I pass a param along to omniauth when authenticating. I tried doing: </p>
  
  <pre><code>/users/auth/facebook?connect_action=signup_connect_to_facebook
  </code></pre>
  
  <p>But that connect_action param didn't make it when it hit AuthenticationsController#Create</p>
  
  <p>Ideas? Thansk</p>