Jindřich Pilař

Thank you for your really swift answer. I didn't realize lazy-load was already supported.

I could implement it in my own project, but I think it deserves to be on original Response. Implementation proposal https://github.com/chriso/klein.php/pull/129

Initially I didn't inteded full-featured `Cache-Control`. But tried to implement it in https://github.com/chriso/klein.php/pull/129