Revert "Merge pull request #93 from vlajos/csslint"

This reverts commit 2852a965e3308dcb81d1d7154e1a25aa72d74139, reversing
changes made to 46bb3dbc361729ba589c73ddd550f7d570f5d26f.

See: https://github.com/facebook/arcanist/pull/93