Update PHUIInfoView

Summary: Just some minor UI tweaks. Make AphrontTagView, add Icons, whiten background.

Test Plan: Legalpad, Settings, Auth, UIExamples, Differential... desktop, mobile.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D16850