[fixed] remove additional es2015 from refCount

This should make the lib work with uglify again

closes #376

Author: claydiffrient

lib/helpers/refCount.js

@@ -1,19 +1,19 @@
 var modals = [];
 
 module.exports = {
-  add (element) {
+  add: function (element) {
     if (modals.indexOf(element) === -1) {
       modals.push(element);
     }
   },
-  remove (element) {
+  remove: function (element) {
     const index = modals.indexOf(element);
     if (index === -1) {
       return;
     }
     modals.splice(index, 1);
   },
-  count () {
+  count: function () {
     return modals.length;
   }
 };