R1:864dd9a196a2

List branch on main repository view

Summary: This is in the crumbs, but a little hidden. Puts branch name at the top of the browse table header.

Test Plan: Review a few branchs, change branch, see new name.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D18441