UC-53 Create a new module for Facebook v2+

Update the Facebook PHP and JS SDK's to the new version and create a new extension to implement the FB connect functionality through them.

https://wikia-inc.atlassian.net/browse/UC-53
We can remove this comment since it was only relevant to the old FBConnect library:

```
	 * This hook was added in MediaWiki version 1.14. See:
	 * http://svn.wikimedia.org/viewvc/mediawiki/trunk/phase3/includes/Skin.php?view=log&pathrev=38397
	 * If we are not at revision 38397 or later, this function is called from BeforePageDisplay
	 * to retain backward compatability.
```