add overall comments and copyright notice
add overall comments and copyright notice

jibsen/imgmin,pornel/imgmin,pornel/imgmin,micmro/imgmin,jibsen/imgmin,micmro/imgmin,micmro/imgmin,rflynn/imgmin,pornel/imgmin,micmro/imgmin,jibsen/imgmin,pornel/imgmin,rflynn/imgmin,jibsen/imgmin,rflynn/imgmin,rflynn/imgmin