Update bootstrap-multiselect.js

Added Array forEach function for browsers that don't support EcmaScript5 (IE 8/9)

js/bootstrap-multiselect.js

@@ -10,6 +10,15 @@
 
     "use strict";// jshint ;_;
     
+    if (Array.prototype.forEach === null || Array.prototype.forEach === undefined) {
+        Array.prototype.forEach = function (func) {
+            var index;
+            for (index = 0; index < this.length; ++index) {
+                func(this[index]);
+            }
+        };
+    }
+
     if (typeof ko !== 'undefined' && ko.bindingHandlers && !ko.bindingHandlers.multiselect) {
         ko.bindingHandlers.multiselect = {