83% Light Colors.

Summary: This adds an 83% Light set of colors for highlights, warnings, etc.

Test Plan: Tested Notifications, Error View, and Color Palette page. Test is out, not quite sure on notifications.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D6239