Add a dedicated HistoryListView for Diffusion

Summary: Going to play a bit with this layout (diffusion sans audit) and see how it feels on profile. Uses a user image, moves the commit hash (easily selectible) and separates commits by date.

Test Plan:
Review profiles with and without commits.

{F4973987}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D18005