Make saved queries editable

Summary: Ref T2625. Rename the "Name" controller to "Edit" and allow it to edit named queries. Also some UI touchups. Add an edit link to the saved query browse view.

Test Plan: Created and edited named queries.

Reviewers: btrahan, blc

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2625

Differential Revision: https://secure.phabricator.com/D6056