zlib interface semi-broken

[Paul Rubin]

Travis <travis+ml-python at subspacefield.org> writes:
> However, perhaps this would be a good time to discuss how this library
> works; it is somewhat awkward and perhaps there are other changes which
> would make it cleaner.
> 
> What does the python community think?

It is missing some other features too, like the ability to preload
a dictionary.  I'd support extending the interface.