Update debian/rules to run `./setup.py test` during build

[Jason Gerard DeRose]

During Barry Warsaw's App Developer Week session, he mentioned how to make debian/rules run `setup.py test` during a build, so that tests are run during daily Launchpad builds and so on. Here's the IRC log:

https://wiki.ubuntu.com/MeetingLogs/appdevweek1104/RockSolidPython

And an example debian/rules (but we need Python3 only):

http://bazaar.launchpad.net/~barry/+junk/adw/view/head:/debian/rules

Also see equivalent bug in `filestore`:

https://bugs.launchpad.net/filestore/+bug/822413

[Michael Chang (thenewme91)]

Initially, the project failed to build from source (FTBFS) upon adding the tests to the build proces; upon inspecting the logs, it appears that debhelper was calling python3.1 to run tests when only python3.2 was installed.

Updating debian/control to include X-Python-Version and X-Python3-Version headers (instead of the outdated XS-Python-Version header, as per the Debian Python Policy[0]) makes it build again.

[0] http://www.debian.org/doc/packaging-manuals/python-policy/ch-module_packages.html

[Michael Chang (thenewme91)]

Merge request submitted, although not sure if I should have split the changes into two branches/requests (one for debian/rules, one for debian/control).