tests fail with python 3.6

[mwhudson]

(master)mwhudson@aeglos:/opt/opensource/deb/beanbag$ PYTHONPATH=. python3.6 `which py.test-3`
======================================================== test session starts =========================================================
platform linux -- Python 3.6.1, pytest-2.8.7, py-1.4.31, pluggy-0.3.1
rootdir: /opt/opensource/deb/beanbag, inifile: 
collected 4 items 

tests/test_attrdict.py .
tests/test_bbv1.py .
tests/test_bbv2.py .F

============================================================== FAILURES ==============================================================
_______________________________________________________ test_sane_inheritance ________________________________________________________

    def test_sane_inheritance():
>       class MyBeanBag(BeanBag):
E       TypeError: __class__ set to <class 'test_bbv2.test_sane_inheritance.<locals>.MyBeanBagBase'> defining 'MyBeanBag' as <class 'test_bbv2.test_sane_inheritance.<locals>.MyBeanBag'>

tests/test_bbv2.py:44: TypeError
================================================= 1 failed, 3 passed in 0.20 seconds =================================================

I haven't looked into this at all!

[ktdreyer]

See #10