avoid using Object.keys (ES5) by changing dependencies map to array w…

…ith object elements

lib/now.js

@@ -385,14 +385,14 @@ var now = {
 };
 
 (function(){
-  var dependencies = {
-    'io': '/socket.io/socket.io.js'
-  };
+  var dependencies = [
+    { key: 'io', path: '/socket.io/socket.io.js'}
+  ];
   var dependenciesLoaded = 0;
 
   var nowJSScriptLoaded = function(){
     dependenciesLoaded++;
-    if(dependenciesLoaded !== Object.keys(dependencies).length) {
+    if(dependenciesLoaded !== dependencies.length) {
       return;
     }
 
@@ -410,17 +410,14 @@ var now = {
     });
   };
 
-  for(var ns in dependencies){
-    if (!dependencies.hasOwnProperty(ns)) {
-      continue;
-    }
-    if (window[ns]) {
+  for(var i=0, ii=dependencies.length; i < ii; i++){
+    if (window[dependencies[i]['key']]) {
       nowJSScriptLoaded();
       return;
     }
     var fileref=document.createElement('script');
     fileref.setAttribute("type","text/javascript");
-    fileref.setAttribute("src", "http://**SERVER**:**PORT**"+dependencies[ns]);
+    fileref.setAttribute("src", "http://**SERVER**:**PORT**"+dependencies[i]['path']);
     fileref.onload = nowJSScriptLoaded;
     if(isIE) {
       fileref.onreadystatechange = function () {