Added 'passive' option to removeEventListener call (to match addEventListener call). Without this fix the listener removal doesn't work in older versions of Safari

Author: Bedford, Nathan

ios-drag-drop.js

@@ -390,7 +390,7 @@ function _exposeIosHtml5DragDropShim(config) {
     el.addEventListener(event, handler, {passive:false});
     return {
       off: function() {
-        return el.removeEventListener(event, handler);
+        return el.removeEventListener(event, handler, {passive:false});
       }
     };
   }