Update diff changeset icons

Summary: Fix size and spacing of file icons in diffs, update with new types, consistency.

Test Plan: Tested a diff in differential

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9372
Convert ButtonBar to FontAwesome

Summary: Removes the sprites and images, uses fontawesome in examples and calendar

Test Plan:
UIExamples, Calendar

{F163375}

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9371
Really pin "applications" to the bottom of the menu, for serious

Summary: Pin it.

Test Plan: Saw it pinned.

Reviewers: chad

Reviewed By: chad

Subscribers: richardvanvelzen, epriestley

Differential Revision: https://secure.phabricator.com/D9373
Merge branch 'master' of github.com:facebook/phabricator