Zeep

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- **backwards-incompatible**: Choice elements are now unwrapped if
maxOccurs=1. This results in easier operation definitions when choices are
used.
- **backwards-incompatible**: The _soapheader kwarg is renamed to _soapheaders
and now requires a nested dictionary with the header name as key or a list
of values (value object or lxml.etree.Element object). Please see the
call signature of the function using ``python -mzeep <wsdl>``.
- Support the element ref's to xsd:schema elements.
- Improve the signature() output of element and type definitions
- Accept lxml.etree.Element objects as value for Any elements.
- And various other fixes

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- **backwards-incompatible**: The kwarg name for Any and Choice elements are
renamed to generic ``_value_N`` names.
- **backwards-incompatible**: Client.set_address() is replaced with the
Client.create_service() call
- Auto-load the http://schemas.xmlsoap.org/soap/encoding/ schema if it is
referenced but not imported. Too many XSD's assume that the schema is always
available.
- Major refactoring of the XSD handling to correctly support nested
xsd:sequence elements.
- Add ``logger.debug()`` calls around Transport.post() to allow capturing the
content send/received from the server
- Add proper support for default values on attributes and elements.

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- Make global elements / types truly global by refactoring the Schema
parsing. Previously the lookups where non-transitive, but this should only
be the case during parsing of the xml schema.
- Properly unwrap XML responses in soap.DocumentMessage when a choice is the
root element. (80)
- Update exceptions structure, all zeep exceptions are now using
zeep.exceptions.Error() as base class.

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- Quote the SOAPAction header value (Derek Harland)
- Undo fallback for SOAPAction if it is empty (83)

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- Use the appdirs module to retrieve the OS cache path. Note that this results
in an other default cache path then previous releases! See
https://github.com/ActiveState/appdirs for more information.
- Fix regression when initializing soap objects with invalid kwargs.
- Update wsse.UsernameToken to set encoding type on nonce (Antonio Cuni)
- Remove assert statement in soap error handling (Eric Waller)
- Add '--no-verify' to the command line interface. (63)
- Correctly xsi:type attributes on unbounded elements. (nicholjy) (68)
- Re-implement xsd:list handling
- Refactor logic to open files from filesystem.
- Refactor the xsd:choice implementation (serializing/deserializing)
- Implement parsing of xsd:any elements.

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- Use the operation name for the xml element which wraps the parameters in
for soap RPC messages (60)