Update ESLint to v3.8.0.
* Installed with `npm install --production` to avoid installing
unnecessary dev files
* Used `dmn -f clean` to further eliminate unneeded files
PR-URL: https://github.com/nodejs/node/pull/9112
Reviewed-By: Teddy Katz <teddy.katz@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
