added state.ES6 option check; bumped dependencies

[drom]

bumped esutils and esprima version for the ES6 stuff added state.ES6 property check bumped eslint version and fixed rules to pass bumped the rest of the packages for the sake of bumping it

[michaelficarra]

This is a good start, but of course there's so much more that needs to be done for full ES6 support.

[drom]

No doubt. Much more needs to be done :sunglasses:

[drom]

Looks like we need to update esutils to progress with ES6.

[michaelficarra]

Yes, I'm sure esutils will need some updates, but not for the purposes of this PR.