Handle CocoonJS special case

src/Tools/babylon.tools.ts

@@ -397,7 +397,7 @@
                     if (request.readyState === 4) {
                         request.onreadystatechange = null;//some browsers have issues where onreadystatechange can be called multiple times with the same value
 
-                        if (request.status >= 200 && request.status < 300) {
+                        if (request.status >= 200 && request.status < 300 || (navigator.isCocoonJS && (request.status === 0))) {
                             callback(!useArrayBuffer ? request.responseText : request.response);
                         } else { // Failed
                             if (onError) {