zipfile and documentation upload to the cheeseshop

[Robert Schuppenies]

I've been in contact with Martin and our problems with uploading the
Python-zipped documentation to the cheeseshop are both, on the
Python and on the PyPI side.

The Python zipfile module does not create explicit directories in
zipfiles, that is "_sources/, _sources/asizeof.txt" for Linux
created zips vs "_sources/asizeof.txt" in the Python-zip. And PyPI
does not handle the case of not having explicit directories
correctly and fails on us.

I have filed a feature request for Python and a bug report for PyPI
and assume that this issue is fixed till the next release of Pympler
is ready to go.

cheers,
robert