Add project tags to Pholio

Summary: T2628, adding project tags to pholio mocks

Test Plan: Create pholio mock, add project tag, save, project tag should show in mock properties on mock view.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9420