.. _tox: https://pypi.python.org/pypi/tox
.. _py.test: http://pytest.org/latest/
.. _YAML 1.1: http://www.yaml.org/spec/1.1/spec.html
.. _YAML 1.2: http://www.yaml.org/spec/1.2/spec.html
.. _PyPI: https://pypi.python.org/pypi
.. _ruamel.yaml: https://pypi.python.org/pypi/ruamel.yaml