Changed the accesstoken login argument from 'access_token' to 'accesstoken'

The server expected the field to be 'accesstoken' instead of
'access_token' so logins would fail.

This resolves that.
Added the Facebook SDK as a Android dependency
The login activity finished before the login was processed

When using the button to do a browser login the login activity
would finish before it got the response. This caused the response
the not get handled. And thus no login being done.
Changed the browser login text to 'Login using our website'
Added a Facebook login button to the login activity