R1:4b9765b89672

Implement PhabricatorProjectInterface in Paste

Summary: Ref T2628. Implements PhabricatorProjectInterface (D9340) in Paste.

Test Plan: See screenshots.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T2628

Differential Revision: https://secure.phabricator.com/D9341