Spiffy up PhamePostView

Summary: Cleaner Author information, less "Properties", Build a History Page. Ref T9897

Test Plan:
Review New Posts, Draft Posts, View History

{F1012934}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T9897

Differential Revision: https://secure.phabricator.com/D14660