Zeep

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- Global attributes are now always correctly handled as qualified. (129)
- Fix parsing xml data containing simpleContent types (136).
- Set xsi:nil attribute when serializing objects to xml (141)
- Fix rendering choice elements when the element is mixed with other elements
in a sequence (150)
- Fix maximum recursion error for recursive xsd:include elements
- Make wsdl:import statements transitive. (149)
- Merge xsd:schema's which are spread around imported wsdl objects. (146)
- Don't raise exception when no value is given for AnyAttribute (152)

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- Use warnings.warn() for duplicate target namespaces instead of raising an
exception. This better matches with what lxml does.
- **backwards-incompatible**: The ``persistent`` kwarg is removed from the
SqliteCache.__init__() call. Use the new InMemoryCache() instead when you
don't want to persist data. This was required to make the SqliteCache
backend thread-safe since we now open/close the db when writing/reading
from it (with an additional lock).
- Fix zeep.helpers.serialize_object() for nested objects (123)
- Remove fallback between soap 1.1 and soap 1.2 namespaces during the parsing
of the wsdl. This should not be required.

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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)