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

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