public function getAuthors()
    {
        if (is_array($this->_authors)) return $this->_authors;
        $this->_authors = array();
        if(!isset($this->_packageXml->authors->author)) {
            return array();
        }
        foreach ($this->_packageXml->authors->author as $_author) {
            $this->_authors[] = array(
                'name' => (string)$_author->name,
                'user' => (string)$_author->user,
                'email'=> (string)$_author->email
            );
        }
        return $this->_authors;
    }