Install EWWW Image Optimizer dependencies on Ubuntu

apt-get install optipng
apt-get install php-imagick
apt-get install libjpeg-progs
apt-get install graphicsmagick
apt-get install gifsicle

wget http://static.jonof.id.au/dl/kenutils/pngout-20150319-linux.tar.gz &&\
tar -xf pngout-20150319-linux.tar.gz &&\
rm pngout-20150319-linux.tar.gz &&\
cp pngout-20150319-linux/x86_64/pngout /bin/pngout &&\
rm -rf pngout-20150319-linux