Opentaxii

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* Docker configuration added.
* Health check endpoint added.
* Basic authentication support added.
* Temporary workaround for `Issue 191 <https://github.com/TAXIIProject/libtaxii/issues/191>`_.
* Method ``get_domain`` in Persistence API returns domain value configured for ``service_id``. If nothing returned, value set in configuration file will be used.
* Performance optimisations.
* Bug fixes and style improvements.

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* Alias for Root Logger added to logging configuration.
* Context object in a request scope that holds account and token added.
* Support for OPTIONS HTTP request to enable auto version negotiation added.
* Documentation improved.

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* Initial release