public static function couchDbClient( $options = array() )
    {
        $_key = Option::get( $options, 'host', 'localhost' ) . ':' . Option::get( $options, 'port', 5984 );

        if ( !isset( self::$_clients[$_key] ) )
        {
            self::$_clients[$_key] = \Doctrine\CouchDB\CouchDBClient::create( $options );
        }

        return self::$_clients[$_key];
    }