UC-29 Update FB Connect Client code

Upgrade the Facebook Connect library in JS and in PHP.  This is necessary to do before March 2015 when the old version of the client code (which we currently use) will no longer work.

https://wikia-inc.atlassian.net/browse/UC-29
@garthwebb, even though this PR is closed, I just have to personally chastise you for adding this onClick handler to the HTML ;). We'll think of a better solution for when we actually roll this out.