public function create($projectId,$taskId,array $params = array())
    {
        $defaults = array(
            'text'      => null,
            'user_id'     => null,
            'user_email'  => null
        );
        $params = array_filter(array_merge($defaults, $params));
        
        $data = array('comment'=>$params);

        $path = '/projects/'.urlencode($projectId).'/tasks/'.urlencode($taskId).'/comments.json';
        return $this->post($path,$data);
    }