Links for collective.optimage
collective.optimage-0.1.0a.zip
http://advsys.net/ken/util/pngout.htm
http://freecode.com/projects/jpegoptim
http://jpegclub.org/jpegtran/
http://optipng.sourceforge.net/
http://pmt.sourceforge.net/pngcrush/
http://www.lcdf.org/gifsicle/
https://github.com/keul/collective.optimage/blob/master/collective/optimage/interfaces.py#L5