Update dependencies

[Swaagie]

Update eslint and babel-eslint to fix the estraverse-fb dependency issue.
To pass our own styleguide/tests the 'use strict' was required.

This works for ES6 would like someone that still uses ES5 to confirm.

Also had to change "sourceType": "string" to "sourceType": "module" for the linting to work on es6 import styles at all. I think this is fine since we create mostly modular es6 modules anyways that are then later packed/bundled with builders.

[jcrugzz]

This LGTM 👍. Still passes on an es5 project

[indexzero]

+1