backport python-pisa

[<marco.pattaro@simplyopen.org>]

Hello,

I made a backport of python-pisa, I see that this package is present in
old-sable and testing but missing in stable. Even though the upstream
development seems discontinued, at the moment it's still an interesting
tool to generate PDFs from various framework like Django. I think it
would be useful to have it in jessie-backports.

Here's the link to the .dsc:
https://mentors.debian.net/debian/pool/main/p/pisa/pisa_3.0.32-4~bpo8+1.dsc

It would be nice if someone could review and upload it.

Thanks
Marco