install many pythons

[keen99]

make a python_install to install many pythons, so you can spec versions.

and when version=... w/ venv/pip, make sure version is installed.

might be most sane to only support from-source in those cases.

path them out accordingly...make sure pipX.X.X is installed, too...

[keen99]

quick answer would be to use a attrs list like
https://github.com/shimizukawa/chef-python-build

and loop on'm.