Now streaming tweets and filtering by screen_name.
Now tracking the given screen_name in the Twitter Api stream.
Now creating a Redbooth task every time the given screen name is mentioned.

To Do:
  1. handle duplicate tweets
  2. The stream cannot be cancelled without a server restart
  3. Only one track query can be performed! Maybe with multi-threading?

Details:
- Made refresh token work for Redbooth Oauth
- "die" function now redirects to the homepage with a flash message
Fixed double-render issue by returning false after each call to die(). Now that it does a redirect, it's returning a redirect string instead of false.  Also, fixed specs that broke since I started using redirects.