For more information see http:/friggeri.net/blog/a-genetic-approach-to-css-compression/.
#Usage
python css.py test.css Simplest possible usage, prints result to stdout
python css.py test.css --output test-gbc.css Put the result in specified file
python css.py test.css --gzip 9 use gzip to weight the algorithm rather than raw size
python css.py test.css other.css concatenate the two files together before running the algorithm