Update FontAwesome to 4.1.0

Summary: 71 new icons! Pied Piper!

Test Plan: tested new icons on UIExample. Perused a few other pages in Maniphest, Differential. No issues noted.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9125