Clean up Phriction History View

Summary: Fixes T4028, makes the table a bit easier to read and navigate changesets.

Test Plan: Tested a big history, back to original and latest.

Reviewers: epriestley, btrahan

CC: Korvin, epriestley, aran

Maniphest Tasks: T4028

Differential Revision: https://secure.phabricator.com/D7438
Merge branch 'master' of github.com:facebook/phabricator