Added 32slptravis testenv, and disabled others.
Shouldn't have uncommented tox install.
Unzip loudly.
bin/python -> bin/python3
Disabled the 32slptravis testenv because the stackless doesn't have a .throw method on tasklet.
Reverting rest of configuration to how it was, minus new (turned off) additions.
Merge branch 'slptravis'. Some disabled Stackless 3 work.