Add authorPHID to Dashboard Panels

Summary: Adds authorPHID to panels so we can default to the panels you made.

Test Plan: Run upgrade, visit manage panels, see my panels. Create a new panel. Edit a panel.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17036