R1:59380582d807

Delete /xhprof/ from directory, mark /mail/ as Admin Only

Summary: /xhprof/ doesn't exist at all, /mail/ is only for admins

Test Plan: Display directory

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley, vrana

Differential Revision: https://secure.phabricator.com/D1405