fix index value not being passed to Hash.each's iterator function

Author: jochenberger

src/prototype/lang/hash.js

@@ -94,11 +94,13 @@ var Hash = Class.create(Enumerable, (function() {
 
   // Our _internal_ each
   function _each(iterator, context) {
+    var i = 0;
     for (var key in this._object) {
       var value = this._object[key], pair = [key, value];
       pair.key = key;
       pair.value = value;
-      iterator.call(context, pair);
+      iterator.call(context, pair, i);
+      i++;
     }
   }