R1:4135c7de372d

Clean up FontAwesome / Timeline CSS

Summary: Normalize FA CSS, expand timeline icons to 14px, fix mobile browsers, give attribution in uiexamples

Test Plan: tested iOS simulator, chrome, ie

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D8845