R1:e529005004d8

Update icons for 14px and 28px transparent layout.

Summary: Used photoshop to produce 14 and 28 pixel icons.

Test Plan: View in photoshop, compress via ImageOptim

Reviewers: vrana, epriestley, btrahan

Reviewed By: btrahan

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3947