Owners -- kill tabs

Summary:
pretty standard MO, but a little tricky in that we dynamically pre-pend
filters for "new", "edit", "search results" and "details" use cases.

Test Plan:
clicked around owners a bunch and verified proper filters showed up
and that when clicked they worked as expected

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley

Maniphest Tasks: T631

Differential Revision: https://secure.phabricator.com/D1516