quintusCore fixed to not override global 'window' object when using m…

…odule.exports.

lib/quintus.js

@@ -28,7 +28,7 @@ various other modules:
 @module Quintus
 */
 
-var quintusCore = function(window,key) { 
+var quintusCore = function(exportTarget,key) { 
   "use strict";
 
 /**
@@ -52,7 +52,7 @@ var quintusCore = function(window,key) {
 
 @class Quintus
 **/
-var Quintus = window[key] = function(opts) {
+var Quintus = exportTarget[key] = function(opts) {
 
   /**
    A la jQuery - the returned `Q` object is actually
@@ -2249,6 +2249,10 @@ var Quintus = window[key] = function(opts) {
 // Lastly, add in the `requestAnimationFrame` shim, if necessary. Does nothing
 // if `requestAnimationFrame` is already on the `window` object.
 (function() {
+    if (typeof window === 'undefined') {
+        return;
+    }
+
     var lastTime = 0;
     var vendors = ['ms', 'moz', 'webkit', 'o'];
     for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {