public static function all($params = null, $apiKey = null)
    {
        return self::_all(get_class(), $params, $apiKey);
    }
public static function all($params = null, $apiKey = null)
    {
        return self::_all(get_class(), $params, $apiKey);
    }
public static function all ( $ params = null , $ apiKey = null ) { return self :: _all ( get_class ( ) , $ params , $ apiKey ) ; }
retrieve all trackers

@param mixed  $params
@param string $apiKey
@return mixed
retrieve all trackers