Determine the primary remote url for this Repository

        Returns:
            str: primary remote url for this Repository
                (``git config remote.origin.url``)

def remote_url(self, remotename='origin'):
        """
        Determine the primary remote url for this Repository

        Returns:
            str: primary remote url for this Repository
                (``git config remote.origin.url``)
        """
        cmd = ['git', 'config', 'remote.%s.url' % remotename]
        return self.sh(cmd, shell=False,
                       ignore_error=True).strip()