code: public T photos_upload(File photo, String caption)
      throws FacebookException, IOException {
      return photos_upload(photo, caption, /*albumId*/null) ;
    }
docs: Uploads a photo to Facebook.
  @param photo an image file
  @param caption a description of the image contents
  @return a T with the standard Facebook photo information
  @see <a href="http://wiki.developers.facebook.com/index.php/Photos.upload">
  Developers wiki: Photos.upload</a>