I must apologize for not getting back to this module recently. There were some comments on the pull request about housekeeping issues. The code is fine, though. I will try to get those cleaned up soon. If anyone is willing to jump in and help with those, I'd be more than happy about that :-)
Im aware that bz2 support is VERY important to get jython properly working with virtualenv installs because some module are only released in tar.bz2 format when installed via easy_install/pip. And I think these kind of compatibility issues are really holding jython back.
I will post another update soon.