Display list of lint problems in Diffusion

Test Plan:
/diffusion/ARC/lint/master/, saw links.
/diffusion/ARC/lint/master/?lint=SPELL0, saw two links.
/diffusion/ARC/lint/master/src/lint/linter/ArcanistFilenameLinter.php?lint=SPELL0, saw link.
Clicked on everything.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Maniphest Tasks: T2038

Differential Revision: https://secure.phabricator.com/D3931