Summary:
This doesn't lay in everything, but:
- Break the buttons gradient apart into components and rebuild it (along with other gradients) into a single gradient sprite (possible after {D4099}).
- Use the sliced gradient for the crumbs background.
- Use the sliced image for the crumb divider.
- Adds the black/white app sheets, but I'm not generating them quite yet.
Test Plan: {F26537} {F26540}
Reviewers: chad, btrahan
Reviewed By: chad
CC: aran
Maniphest Tasks: T1960
Differential Revision: https://secure.phabricator.com/D4100
