R1:5f1a359a92de

Add a UIExamples page for new project image builtins

Summary: Adds a page to view all and their path in UIExamples.

Test Plan: Review page in UIExamples, hover over image for path.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D18196