Herald - tighten up rule display

Summary: we were bad at displaying phid-based values nicely. Now we are good at it.

Test Plan: made a herald rule where if the author was a or b, the task should be assigned to c and have projects x, y, z added to it. this displayed nicely.

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D7158