UC-21 Disable/remove push notifications from facebook Connect

The functionality for push notifications for Facebook connect has been broken for some time (see UC-20). This ticket cleans up all of the broken Facebook Connect code which had to do with pushing notifications, and removes all the references to that feature on the user facing side.

Ticket: https://wikia-inc.atlassian.net/browse/UC-21
Yea, exactly. The code is all ripped out so it would never work. I didn't want to leave any references to the push feature, even in the sample config, in case someone looked at it later and thought it was a feature that we might still support.