Started development on 1.7~dev
Now use py.test instead of nosetests
Updated debian package to recommand pytest instead of nose
Removed pytest from install requires of Python package
Removed debian packaging from this branch

Debian packaging is moved to a specific "debian-*" branch.
Added compatibility with Python3
PEP8 fixes (whitespaces only)
Removed debian packaging from this branch

Debian packaging is moved to a specific "debian-*" branch. This commit
fixes c6e210c2 which is oddly not complete.
Released version 1.7