Colander

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- The constructor arguments to a the ``colander.Schema`` class are now
sent to the constructed SchemaNode rather than to the type it represents.

- Allow ``colander.Date`` and ``colander.DateTime`` invalid error
messages to be customized.

- Add a ``pos`` argument to the ``colander.Invalid.add`` method.

- Add a ``__setitem__`` method to the ``colander.Invalid`` class.

- The ``colander.Mapping`` constructor keyword argument
``unknown_keys`` has been renamed to ``unknown``.

- Allow ``colander.Mapping`` type to accept a new constructor
argument: ``partial``.

- New interface methods required by types and schema nodes:
``pserialize`` and ``pdeserialize``. These partially serialize or
partially deserialize a value (the definition of "partial" is up to
the type).

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- 0.4 was mispackaged (CHANGES.txt missing); no code changes from 0.4
however.

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- Add ``colander.DateTime`` and ``colander.Date`` data types.

- Depend on the ``iso8601`` package for date support.

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- Subnodes of a schema node are now kept in the ``children`` attribute
rather than the ``nodes`` attribute.

- Add an ``sdefault`` property to ``colander.SchemaNode`` objects.

- Add a ``clone`` method to ``colander.SchemaNode`` objects.

- Add a ``__str__`` method to the ``colander.Invalid`` exception that
prints an error summary.

- Various error message improvements.

- Add ``colander.Length`` validator class.

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- Make nodetype overrideable.

- Add __getitem__ to SchemaNode.

- Fix OneOf message.

- Capitalize node titles.

- Deal with empty strings in String, Boolean, and Float types.

- Introduce description; make title the same as name.

- Remove copy method from schemanode.

- Allow schema nodes to have titles.

- The term "structure" is too overloaded to use for schema purposes:
structure -> schema node.

- Make Sequence more like Tuple and Mapping (it uses a substructure
rather than a structure parameter to denote its type).

- Add __repr__ and copy methods to structure.

- Add accept_scalar flag to Sequence.

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- Initial release.