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
Here, lines 399-407, 423-435, and 555-559 aren't related to push notifications. Instead I'm just removing commented out code which was all over this file.