Clarify "Closed" revision status with VCS-specific language
Summary: Instead of rendering "Revision Status: Closed (Sat, Apr 28, 10:28 AM)", render "Revision Status: Closed (Pushed Sat, Apr 28, 10:28 AM)", or "Committed", as appropriate.
Test Plan: Looked at a committed revision.
Reviewers: btrahan, vrana, jungejason
Reviewed By: jungejason
CC: jeffmo, rdbayer, aran
Maniphest Tasks: T909
Differential Revision: https://secure.phabricator.com/D2334