Mqttwarn

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- Remove "Topic :: Internet :: MQTT" from the list of trove classifiers
after PyPI upload croaked again

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- Update author email within setup.py after PyPI upload croaked at us

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- Add foundation for unit tests based on pytest
- Add test harness
- Integrate changes from the main branch
- Improve documentation, add a more compact ``README.rst`` and
move the detailed documentation to ``HANDBOOK.md`` for now.
- First release on PyPI

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- Use EPL 2.0 license as recently approved by pypa and jpmens
- Add missing dependency to the "six" package

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- Add mechanism to run a notification service plugin interactively from the command line
- Attempt to fix 307 re. logging to the configuration .ini file. Thanks, Dan!

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- Add .bumpversion.cfg and Makefile to ease release cutting
- Move "websocket" service plugin (305) into module namespace
- Refactor two more functions into ``class RuntimeContext``
- Improve error handling: Add the ``exception_traceback()`` primitive to add
full stacktrace information to log messages. When applied at all important
places across the board where we do catch-all style exception handling,
this will improve the experience when working on custom solutions with
*mqttwarn* to a huge extent.
- Improve documentation