Endpoint: /photo/upload.json

        Uploads the specified photo filename.

def upload(self, photo_file, **kwds):
        """
        Endpoint: /photo/upload.json

        Uploads the specified photo filename.
        """
        with open(photo_file, 'rb') as in_file:
            result = self._client.post("/photo/upload.json",
                                       files={'photo': in_file},
                                       **kwds)["result"]
        return Photo(self._client, result)