Changes the position of an item within its parent list. It does not
        currently support reparenting an item. Position 1 is at the top of the
        list. Moving an item beyond the end of the list puts it at the bottom
        of the list.

def move_todo_item(self, item_id, to):
        """
        Changes the position of an item within its parent list. It does not
        currently support reparenting an item. Position 1 is at the top of the
        list. Moving an item beyond the end of the list puts it at the bottom
        of the list.
        """
        path = '/todos/move_item/%u' % item_id
        req = ET.Element('request')
        ET.SubElement(req, 'to').text = str(int(to))
        return self._request(path, req)