Updated to Font Awesome 4.1

Summary:
* fixes T345
* replaces sass files & updates paths
* replaces font files

Test Plan:
* double check font paths
* test new fonts

Reviewers: shadowhand, rjmackay

Reviewed By: rjmackay

Subscribers: sebm90, rjmackay, dkobia

Maniphest Tasks: T345

Differential Revision: https://phabricator.ushahidi.com/D173