Initial work on xml-codec
Corrected TODO message
Added serialises for date, time and datetime to an ISO format
Serialisers for datetime data types
Added test coverage for serialisers
Python 3 gotcha, numbers can't start with leading 0's
Merge remote-tracking branch 'origin/xml-codec' into development
Allow the type field to be overridden from the default of `$`
Merge branch 'master' into development
Renamed ArrayOf to ListOf, backwards compatible
Added utility lists that create attribute and element fields
Changed ObjectField from class to just being a reference to a DictField
Added xml_codec.dump and dumps methods and updated some early tests
Fix python3 compatibility
Correct typo
Added initial documentation for the xml_codec