Add a Conpherence Profile Menu Item

Summary: Builds a Conpherence Profile Menu Item, complete with counts for the unreads. This allows pinning to home as well as swapping out thread list in Conpherence for pinning eventually.

Test Plan: Add a menu item, chat in room, log into other account, see room count. Room count disappears after viewing.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17662