R1:aefc006ba503

Move DiffusionHistoryListView to DiffusionCommitListView

Summary: I think this name is more accurate, also add proper links to author image.

Test Plan: Review commits in sandbox, see new URL on image.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D18026