Adds the XMLHttpRequest object to the uploadFinished callback. RESTfu…

…l APIs can and will use response headers quite extensively and they should be accessible in uploadFinished. In my case the API responds with a 201 Created and a link to the newly created resource in the Location-header.

jquery.filedrop.js

@@ -299,7 +299,7 @@
             if (xhr.responseText) {
               var now = new Date().getTime(),
                   timeDiff = now - start_time,
-                  result = opts.uploadFinished(index, file, jQuery.parseJSON(xhr.responseText), timeDiff);
+                  result = opts.uploadFinished(index, file, jQuery.parseJSON(xhr.responseText), timeDiff, xhr);
               filesDone++;
 
               // Remove from processing queue