Koppeltaal

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- Make sure to pass a unicode filename to ConfigParser. This prevents a
warning under Python 2.7.14.

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- Python 3 compatibility. The adapter now formally supports Python 2.7 and
Python 3.6 through the `six` compatibility layer..

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- Koppeltaal server does not properly format message headers for
CreateOrUpdateActivityDefinition, add a fix to still allow those
messages.

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- Add Organization resource.

- Add support for careProvider and managingOrganization on Patient
resource.

- Add support for birthDate, gender and organization on Practitioner
resource.

- Add a DummyConnector. This has the same API than a connector but
does not do anything. That's useful when you want to make sure your
application works, but cannot talk to the Koppeltaal server.

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- Packaging fixes in preparation for the first public release on
https://pypi.python.org/pypi.

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- Add `includearchived` support to list archived `ActivityDefinition`.

- Do not log everything in the console script unless the verbose
option is used.