This project has not seen any updates in a long time. I have simply not had the time to keep it up to date.
When django-compress started, there were no other asset managers for Django. Today, it looks quite different, with a wide variety of high quality packages. I am glad to see that some of the code and ideas has been the foundation for other asset managers.
Since there are so many other awesome alternatives today, and I am not going to maintain django-compress anymore.
See http://djangopackages.com/grids/g/asset-managers/ for a fairly complete list of available asset managers for Django.
If you already are already using django-compress, you are strongly encouraged to switch to django-pipeline, which is a well maintained fork, with a lot of new features.
See django-pipelines documentation  for more information on the changes and features.