Add 'My Mocks' filter to Pholio

Summary: Add the ability to filter Pholio on Mocks I added.

Test Plan: Went to test user account, no mocks, went to my account, saw mocks.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4974