Zope.schema

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- PEP 8 cleanup.

- Don't raise RequiredMissing if a field's defaultFactory returns the field's
missing_value.

- Update ``boostrap.py`` to version 2.2.

- Add the ability to swallow ValueErrors when rendering a SimpleVocabulary,
allowing for cases where vocabulary items may be duplicated (e.g., due to
user input).

- Include the field name in ``ConstraintNotSatisfied``.

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- Fix Python 2.6 support. (Forgot to run tox with all environments before last
release.)

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- Make sure that we do not fail during bytes decoding of term token when
generated from a bytes value by ignoring all errors. (Another option would
have been to hexlify the value, but that would break way too many tests.)

==================

- Fix a bug where bytes values were turned into tokens inproperly in
Python 3.

- Add ``zope.schema.fieldproperty.createFieldProperties()`` function which
maps schema fields into ``FieldProperty`` instances.

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- Add support for Python 3.3.

==================

- Fix the default property of fields that have no defaultFactory attribute.