ENYO-2987: Change enyo.super to enyo.inherit to avoid clash with ES3 res...

...erved work

- Restore .jshintrc to check es3: true now that we're not using super.
- Add inline docs for enyo.inherit()

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)