Only allow XHR status 0 for local file:// URLs

Since 0 can also be an error situation, limit the amount we okay it.

Author: Ithamar

src/loader/File.js

@@ -315,7 +315,10 @@ var File = new Class({
      */
     onLoad: function (xhr, event)
     {
-        var success = !(event.target && (event.target.status !== 200 && event.target.status !== 0));
+        var localFileOk = xhr.responseURL.indexOf('file://') == 0 &&
+            event.target.status === 0;
+
+        var success = !(event.target && event.target.status !== 200) || localFileOk;
 
         //  Handle HTTP status codes of 4xx and 5xx as errors, even if xhr.onerror was not called.
         if (xhr.readyState === 4 && xhr.status >= 400 && xhr.status <= 599)