Request : File uploading status

I just love your file uploading feature. If you can giver uploading status then it will be great..

``` java
File myFile = new File("/path/to/file.png");
RequestParams params = new RequestParams();
try {
    params.put("profile_picture", myFile);
} catch(FileNotFoundException e) {}
```

You can make interface to get uploading status. It can be in percentage or you can count bytes uploaded.
