Python deprecation issues

[masojus]

A few straggling issue that are still specific to deprecated/varying versions:

• The TOX config still refers to py26 , py32 and py33 and is missing versions.
• The setup.py still refers to some issues with nose and multiprocessing that might not still apply--worth a quick test.
• This whole check_project_id() situation perhaps could be replaced with isinstance(value, six.string_types)
• There are probably a few more we'll tackle as we notice them.