Callback when a gconf key changes

def _key_changed(self, client, cnxn_id, entry, data=None):
        """
        Callback when a gconf key changes
        """
        key = self._fix_key(entry.key)[len(self.GCONF_DIR):]
        value = self._get_value(entry.value, self.DEFAULTS[key])

        self.emit('conf-changed', key, value)