R1:a0bf9a290a6b

Use font-awesome for busy indicator

Summary: Testing out using a gear instead of compass gif and background. Let me know how it feels

Test Plan:
UIExamples busy page

{F353571}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D12201