Zeep

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- Extend the force_https flag to also force loading xsd files from https when
a http url is encountered from a https domain
- Fix handling recursive xsd imports when the url's are enforced from http to
https.
- Fix reference attribute when using the Binary Security Token (873, tpazderka)
- Add support for the WSAM namespace (890, David Adam)

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- Fix abstract message check for NoneType before attempting to access parts
- Improve support for 'Chameleon' XSD schemas (879, 888)
- Fix resolving qualified references (879)
- Fix issue with duplicate soap:body tags when multiple parts used (879)
- Fix Choice with unbound Any element (871)
- Add xsd_ignore_sequence_order flag (880)
- Add support for timestamp token in WSS headers (817)
- Accept strings for xsd.DateTime (886)

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- Fix SSL issue on with `TornadoAsyncTransport` (792)
- Fix passing strict keyword in XML loader (787)
- Update documentation

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This is a major release, and contains a number of backwards incompatible
changes to the API.

- Refactor the settings logic in Zeep. All settings are now configured using
the zeep.settings.Settings() class.
- Allow control of defusedxml settings via zeep.Settings (see 567, 391)
- Add ability to set specific http headers for each call (758)
- Skip the xsd:annotation element in the all:element (737)
- Add Settings.force_https as option so that it can be disabled (605)
- Strip spaces from QName's when parsing xsd's (719)
- Fix DateTime parsing when only a date is returned (672)
- Fix handling of nested optional any elements (556)
- Check if part exists before trying to delete it (659)

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- Fix AnyType value rendering by guessing the xsd type for the value (552)
- Fix AnySimpleType.xmlvalue() not implemented exception (644)
- Add __dir__ method to value objects returned by Zeep
- Don't require content for 201 and 202 status codes (613)
- Fix wheel package by cleaning the build directory correctly (634)
- Handle Nil values on complexType with SimpleContent elements (604)
- Add Client.namespaces method to list all namespaces available
- Improve support for auto-completion (537)

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- Add support for tornado async transport via gen.coroutine (530, Kateryna Burda)
- Check if soap:address is defined in the service port instead of raising an
exception (527)
- Update packaging (stop using find_packages()) (529)
- Properly handle None values when rendering complex types (526)
- Fix generating signature for empty wsdl messages (542)
- Support passing strings to xsd:Time objects (540)