Homestyx hydra

R1:74d86f09023c

Migrate Pholio image description and mock status to modular transactions

Summary: Also removes more now-dead code from `PholioTransaction`.

Test Plan: opened and closed a bunch of mocks, edited a bunch of image descriptions

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D17868
Repository: R1 hydra
Commit Date: May 12 2017