Integrate Pholio with Herald

Summary: Ref T2766. Does the integration via ApplicationTransactionsEditor. Only did addCC and Flag for proof of concept.

Test Plan: Made a rule to cc, made a rule to flag. They worked! (will attach screens to diff)

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, aran

Maniphest Tasks: T2766

Differential Revision: https://secure.phabricator.com/D6766