R1:e498d4476d4f

Fix some Quicksand bugs

Summary: Packages AppSearch, fixes body color, moves Differential filetree into differential package.

Test Plan: Enable quicksand. Navigate home -> differential -> diff.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D16641