Delete temp dir if not save_temp set at __init__

def clean(self):
        """ Delete temp dir if not save_temp set at __init__ """
        if not self._save_temp:
            if hasattr(self, '_written_files'):
                map(os.unlink, self._written_files)
            if getattr(self, '_remove_tempdir_on_clean', False):
                shutil.rmtree(self._tempdir)