UC-90 Made some changes to update mobile for new FB

This mostly amounted to making sure the newest JS SDK was being loaded and removing some cruft.

Also updated to current style guidelines.

https://wikia-inc.atlassian.net/browse/UC-90
This is a V2 update.  Technically we could just have this always be 'sdk.js' now since by the time this is released we should have already moved off the old FB code.  But, keeping this in just to not jump the gun.