R1:c72e2f35f3db

Edit dashboard panels in a dialog instead of on a separate page

Summary: When you "Edit Panel" on a dashboard, pop a dialog instead of redirecting to a different page.

Test Plan: Edited a panel from a dashboard; edited a panel from the panel workflow.

Reviewers: chad

Reviewed By: chad

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D9499