UC-18 Add Tracking for Facebook interactions

We need a way to independently track user Facebook interactions (login, connect, disconnect, logout...)
This PR adds those tracking code, so that we can track these actions internally and on GA.

RFCR @garthwebb & @lizlux 

Ticket: https://wikia-inc.atlassian.net/browse/UC-18
Couple notes on the terms we send to GA/DW - In https://docs.google.com/a/wikia-inc.com/spreadsheet/ccc?key=0AsB-XECKL5EhdDlyTVdOWVM3MmRvcElUWUQ0ZnpVOFE&pli=1#gid=0 you can see that there's already some tracking set up around facebook login, so I just want to make sure you considered adding on to those categories as opposed to creating a new category, "facebook". 

Also, if we're already sending "facebook" as a category, there's no need to include the term "facebook" in the label.