Replace action sprite with FontAwesome
Summary: Replaces the action icons in action headers with FontAwesome
Test Plan:
- grep SPRITE_ACTIONS
- grep sprite-actions
- Replace on UIExamples
- Replace on Workboards
- Replace on Dashboards
- Replace on FeedStories
{F157840}
{F157841}
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D9230
