This grabs the list of changed and added files that match the set we expect to
be able to lint and runs them through eslint displaying simple messages on error.
--HG--
extra : commitid : FVxtG7pqP4a
extra : rebase_source : 49dde3431f40a395e36caa3f37819a91a65d3c90
extra : amend_source : fd3ce711f6204205f95d8e28ae1f4ca6b3e0fd25