[fixed] Removed additional es2015 causing problems

closes #380

Author: claydiffrient

lib/helpers/refCount.js

@@ -7,7 +7,7 @@ module.exports = {
     }
   },
   remove: function (element) {
-    const index = modals.indexOf(element);
+    var index = modals.indexOf(element);
     if (index === -1) {
       return;
     }