Summary:
Ref T3186. Brings another linter onboard. This one uses the stdin stuff.
The unit test was ostensibly broken so I fixed it, but that might just be some kind of version issue.
Test Plan: Unit tests.
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T3186
Differential Revision: https://secure.phabricator.com/D6802
Summary: flake8 is the better maintained combination of pep8 and pyflakes
Test Plan: There's a test!
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin, jack
Differential Revision: https://secure.phabricator.com/D4082