Softlayer-zeep

-------------------
- 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.

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

------------------
- 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.

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

------------------
- Add ability to override the soap endpoint via `Client.set_address()`
- Fix parsing ComplexTypes which have no child elements (50)
- Handle xsi:type attributes on anyType's correctly when deserializing
responses (17)
- Fix xsd:restriction on xsd:simpleType's when the base type wasn't defined
yet. (59)
- Add xml declaration to the generate xml strings (60)
- Fix xsd:import statements without schemaLocation (58)

------------------
- Fix regression with handling wsdl:import statements for messages (47)