R1:a8cf612fe050

Make Phame Blogs and Posts Flaggable

Summary: Will attempt at modernizing Phame in smaller pieces. First up, flagging.

Test Plan: Flag a Post, Flag a Blog

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D13668