title: jQuery.event.props is undefined
body: <p>I'm using <a href="https://github.com/stephband/jquery.event.move" rel="noreferrer">jquery.event.move</a> to create move events on touch devices. 
  The script is throwing an error on line 580.</p>
  
  <pre><code>570 // Make jQuery copy touch event properties over to the jQuery event
  571 // object, if they are not already listed. But only do the ones we
  572 // really need. IE7/8 do not have Array#indexOf(), but nor do they
  573 // have touch events, so let's assume we can ignore them.
  574 if (typeof Array.prototype.indexOf === 'function') {
  575     (function(jQuery, undefined){
  576         var props = ["changedTouches", "targetTouches"],
  577             l = props.length;
  578         
  579         while (l--) {
  580             if (jQuery.event.props.indexOf(props[l]) === -1) {
  581                 jQuery.event.props.push(props[l]);
  582             }
  583         }
  584     })(jQuery);
  585 };
  </code></pre>
  
  <p>When it gets to line 580 it throws <code>Uncaught TypeError: Cannot read property 'indexOf' of undefined</code>
  The way I understand it is that jQuery.event.props is undefined? Shouldn't this array be present by default in jquery? 
  I've "installed" jQuery in my rails app as a gem (jquery-rails 4.1.1)
  Any idea what I could do? </p>