python-debian 0.1.21-nmu2 has been uploaded to PyPI

No need to specify a requirements.txt anymore.
Don't expect epochs in filenames
Use mkstemp rather than higher-level interfaces

Should close #2.
Downgrade the check for debian revisions on native packages to a warning

Those aren't supposed to happen, but do: ['grub_0.95+cvs20040624-19.tar.gz']