Integrates OAuth

Adds library to facilitate oauth dance and acquire token.

Includes middleware to detect when new token is needed, method to get token or dispatch request to middleware, code to handle both sides of the oauth request, and database model to store tokens.

Depends on django's auth-middleware

@kyfantaz 
That doesn't work with the application being in a namespace because the admin module itself defines a name space.  We can change that in the namespace elimination refactor.