PHUIInfoPanel

Summary: First cut of an 'info panel' for phabricator. Basic concept is for display a list of items with a bit more info and depth and an object item list. Projects could be a good first example.

Test Plan: UIExamples

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7398