Conpherence - add draft support
Summary: Fixes T3497.
Test Plan: on conpherence 1, typed some stuff. clicked conpherence 2 - observed some stuff gone. clicked conpherence 1 - stuff came back! submitted conpherence 1 and reloaded - stuff did not come back. (Generally played around a bunch like this)
Reviewers: epriestley
Reviewed By: epriestley
CC: Korvin, epriestley, aran
Maniphest Tasks: T3497
Differential Revision: https://secure.phabricator.com/D8266