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
this is a tad difficult to read.  Perhaps separate `call_user_func_array` to it's own line and concatenate in the result?
```
$prepared_clauses = call_user_func_array( array( $wpdb, 'prepare' ), $prepare_args );
$clauses['where'] = preg_replace(
	'#^\( (comment_approved = \'0\' OR comment_approved = \'1\') \)#',
	'( ${1} ' . $prepared_clauses . ' )',
	$clauses['where']
);
```