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
Maybe (for VIP friendliness):

1. Separate the query out into a variable
1. `%s` the table name and the `$where`
1. Wrap the whole sql statement in a `prepare`