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
Since this could be a link that is rendered on the public facing side, I wonder if we should avoid using `$_GET` (VIP gets itchy about its usage) and instead pass in an optional 3rd parameter to this function called `$args` (or something).  Then, from `comment_status_links_add()` - which is where I'm guessing the `$_GET` variables come into play - can pass `$_GET` as `$args`.