Use eslint and stylelint, fix all errors (#282)

* Use eslint and stylelint, fix all errors

* Remove jshint, jsbeautify
* Use Object.keys directly since that is available in all major browsers
* Fixes for eslint, stylelint errors
* stylelint is not included in grunt test yet because jquery.uls.mobile.css
  has so many !important and need to figure out whether they are really needed

test/jquery.uls.test.js

@@ -13,8 +13,6 @@
  *
  */
 
-/*jshint sub:true */
-
 ( function ( $ ) {
 	'use strict';