Httpx-gssapi

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- Allow non-HTTP service principals with HTTPKerberosAuth using a new optional
argument ``service``.

- Fix bug in ``setup.py`` on distributions where the ``compiler`` module is
not available.

- Add test dependencies to ``setup.py`` so ``python setup.py test`` will work.

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- Minor updates in the README
- Change requirements to depend on requests above 1.1.0

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- Work with servers operating on non-standard ports

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- Not documented

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- Initial Release

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- Fork project to httpx-gssapi
- Replace all requests handling to support HTTPX
- Remove HTTPKerberosAuth shim