Uc 85 - porting fbconnect.js to FacebookClient extension JS

Don't merge yet.

This PR is an audit of the current usages of fbconnect.js, which will be removed from the code base once the switch to the facebook sdk v2.x is completed. 

It includes some code cleanup of the CommentsLikes module, which had migrated to V2 but had never been cleaned up. Since it was calling some FB functions, I decided to clean up the code.