Update ArcanistCoffeeLintLinter to be compatible with CoffeeLint v1.4.0.
Summary: CoffeeLint v1.4.0 deprecated the --checkstyle flag in favor of --reporter=checkstyle.
Test Plan: arc unit
Reviewers: epriestley, Blessed Reviewers
Reviewed By: epriestley, Blessed Reviewers
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D9181