HOLD: Feedback faves and flags

This is the PR for the feedback faves and flags.

See: https://github.com/GigaOM/gigaom/milestones/Comment%20redesign%20v3:%20faves%20and%20flags
It is true that `success` is deprecated as function of the jqXHR promise object, however, I do not believe that it is deprecated as a property of `$.ajax()` setting. (in _this_ case, `success` is an [Ajax Event](http://api.jquery.com/Ajax_Events/) that reacts to the `XMLHttpRequest `ajaxSuccess` event).