ENYO-2987: Change enyo.super to enyo.inherit to avoid clash with ES3 reserved 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)
Merge pull request #408 from enyojs/ENYO-2987

Reviewed-By: Cole Davis (cole.davis@lge.com)

ENYO-2987: Change enyo.super to enyo.inherit to avoid clash with ES3 res...
Update documentation blocks for the enyo.super -> enyo.inherit change

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)