>>> package = yarg.get('yarg')
            >>> package.author
            Author(name=u'Kura', email=u'kura@kura.io')

def author(self):
        """
            >>> package = yarg.get('yarg')
            >>> package.author
            Author(name=u'Kura', email=u'kura@kura.io')
        """
        author = namedtuple('Author', 'name email')
        return author(name=self._package['author'],
                      email=self._package['author_email'])