support destination file - as stdout
support destination file - as stdout

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