Is this compatible with eslint 2.x?

[derwaldgeist]

I tried to use this in combination with eslint versions 2+, but always got an error message

`Unexpected top-level property "ecmaFeatures"``

Looking into the eslint docs, I saw that ecmaFeatures is now a sub-key under parserOptions. I guess this is not reflected here. Would it be possible to upgrade this to the latest version?

[oquis]

I created a PR to fix this issue (#7)