Homestyx hydra

R1:eaaba278a976

Convert PonderAnswer to modular transactions

Summary: Fixes T12624. Converts PonderAnswer over to modular transactions.

Test Plan:
- Add an answer
- Edit an answer
- Hide an answer
- Comment on an answer

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12624

Differential Revision: https://secure.phabricator.com/D17811
Repository: R1 hydra
Commit Date: May 1 2017