Use new-style classes

[ewheeler]

Classes should subclass object to ensure compatibility among Python 2.x and Python 3.x versions.
Without subclassing object these classes are 'old-style' which have some very different behaviors around how super works and several other differences. Read more here: https://www.python.org/doc/newstyle/

The Facade and FakeResponse classes, for example, should be updated:
https://github.com/unicefuganda/eums/blob/master/eums/vision/vision_facade.py#L32
https://github.com/unicefuganda/eums/blob/master/eums/rapid_pro/fake_response.py#L1

Also some here:
https://github.com/unicefuganda/eums/blob/master/eums/test/services/mock_celery.py

[wanderanimrod]

Hi Evan,

Thanks for pointing this out. The team is going to ensure the any new classes created are python 3 compatible.

I will close this issue once we have cleaned out the codebase in the areas you pointed out. Part of this work has already been done.

Thank you.