pwkit/phoenix.py: stubby code to load Phoenix data files

Something else to preserve from dracut just in case.
setup.py: require Numpy 1.6

I don't think we truly need anything else. Various bits require
Scipy and/or Pandas, but there's plenty of functionality that doesn't
need those.
pwkit/__init__.py: docstring tweak
setup.py: let's call this version 0.2.0