Populate request.body from bodyAsJson if given

If RequestBuilder.from_dict() is given a bodyAsJson field and no body
field, it makes sense to populate the requesty.body field with the
serialized value of bodyAsJson.

Fixes test_runner logging of graphql requests which makes this assumption.

Reformats setup

Replace setuptools.errors with distutils.errors

Doing this makes us compatible with the
  python3 -m venv .venv
setup, without any extra step required to use virtualenv or upgrade
setuptools.

Version 0.0.14.

Bump version to 0.0.13

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