Add python 2.7 to test matrix
Don't force version of python in test runner
Backwards compatible "super" in serializer tests
Backwards compatible super calls in serializers.py
Python version agnostic testing of utf8
Use mock if unittest.mock is not available
Use assertItemsEqual on python 2
Remove python3-only ChainMap, keyword-only args

Use mock if unittest.mock is not available
Use python2 compatible unicode __str__
Use python2 super(), subclass mixin from object
Use mock on python3 as well as python2
Comment assertItemsEqual/assertCountEqual py2/3
Merge pull request #9 from incuna/python2tests

Add python 2.7 to test matrix