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 
As noted above, the admin module doesn't work in a namespaced app.  We can put it back here after the elimination of the namespace refactor.