feat(protractor): add iteration index to ElementArrayFinder.each

Author: rleite

lib/protractor.js

@@ -277,8 +277,8 @@ var buildElementHelper = function(ptor) {
    */
   ElementArrayFinder.prototype.each = function(fn) {
     return this.asElementFinders_().then(function(arr) {
-      arr.forEach(function(elementFinder) {
-        fn(elementFinder);
+      arr.forEach(function(elementFinder, index) {
+        fn(elementFinder, index);
       });
     });
   };