Pholio - allow Pholio Mocks to be attached to Maniphest Tasks (and vice versa)
Summary: Fixes T2654.
Test Plan: attached lots of mocks and tasks to one another from both maniphest and pholio. verified transactions rendered okay in both applications
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Maniphest Tasks: T2654
Differential Revision: https://secure.phabricator.com/D6501