Hbmqtt

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* Fix `duplicated $SYS topic name <https://github.com/beerfactory/hbmqtt/issues/37>`_ .

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* Fix a `serie of issues <https://github.com/beerfactory/hbmqtt/issues?q=milestone%3A0.7+is%3Aclosed>`_ reported by `Christoph Krey <https://github.com/ckrey>`_

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* Fix issue `22 <https://github.com/beerfactory/hbmqtt/issues/22>`_.

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* Fix issue `20 <https://github.com/beerfactory/hbmqtt/issues/20>`_ (``mqtt`` subprotocol was missing).
* Upgrade to ``websockets`` 3.0.

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* Fix issue `19 <https://github.com/beerfactory/hbmqtt/issues/19>`_

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* Added compatibility with Python 3.5.
* Rewritten documentation.
* Add command-line tools :doc:`references/hbmqtt`, :doc:`references/hbmqtt_pub` and :doc:`references/hbmqtt_sub`.