Add an ArcanistGoLintLinter.
Summary: Create bindings for golint as an external linter.
Test Plan: Wrote and executed unit tests.
Reviewers: Blessed Reviewers, epriestley
Reviewed By: Blessed Reviewers, epriestley
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D9246