ESLint Airbnb

[davixyz]

This might be a little controversial but:
As we move into ES6 world it would be good to also update the linter to a harder one
Here's my suggestion:
https://github.com/airbnb/javascript
Using:
https://www.npmjs.com/package/eslint-config-airbnb-base

If we don't go the ES6 path there's also a legacy ES5 airbnb linter

[vvscode]

And this one I'm also ready to take

[chazzmoney]

Might consider doing this in conjunction with #153

Actually, maybe we should wait on both of these until we merge #169

[vvscode]

@davixyz what about closing?

[dbanksdesign]

Sorry about that! Done! Thanks again for the contribution!