Display lint overview in Diffusion
Summary: I will add links from /diffusion/ARC/lint/ in future diff.
Test Plan:
/diffusion/ - clicked on lint messages link.
/diffusion/ARC/ - clicked on lint messages link.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D3926