Add Revisions to User Profiles

Summary: Ref T12423. Adds back revisions as a user profile page. I don't want to think about custom profiles for a while.

Test Plan: Make some diffs, visit my profile, see diffs.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12423

Differential Revision: https://secure.phabricator.com/D17987