Changed the browser login text to 'Login using our website'
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.
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.
Added the Facebook SDK as a Android dependency
Added a Facebook login button to the login activity
Merge branch 'feature/facebook-login' of github.com:MMS-Projects/copyit-app into feature/facebook-login