• Use tox for cross-version automated testing.
• Convert Action and related types to use TypedField implementation.
• Convert DateRange type to use TypedField implementation.
• Add Frequency type.
• Register concrete implementations of Account-related classes in the parent bindings.
• Add support for Events.
• Allow recursive definition of Events in bindings.
• Improve output of date strings.
• Improve JSON handling of empty lists (for input and output).
• Improve namespace handling for XML output.
• Fix errors where incorrect types were being used in the bindings.
• [#16] Use correct binding class.
• Fix typos.