Lint the JS config files in the root of the repo (#338)
Lint the JS config files in the root of the repo (#338)

Previously the `.neutrinorc.js` and `.eslintrc.js` files were not
being included in the eslint run.
mozilla-neutrino/neutrino-dev,eliperelman/neutrino-dev,mozilla-neutrino/neutrino-dev,edmorley/neutrino-dev,edmorley/neutrino-dev