Zope-schema

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- Add the doctests to the long description.

- Remove use of deprecated 'sets' module when running under Python 2.6.

- Remove spurious doctest failure when running under Python 2.6.

- Add support to bootstrap on Jython.

- Add helper methods for schema validation: ``getValidationErrors``
and ``getSchemaValidationErrors``.

- zope.schema now works on Python2.5

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Add BeforeObjectAssignedEvent that is triggered before the object
field sets a value.

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Corresponds to the version of the zope.schema package shipped as part of
the Zope 3.3.0 release.

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Corresponds to the version of the zope.schema package shipped as part of
the Zope 3.2.1 release.

Fix missing import of 'VocabularyRegistryError'. See
http://www.zope.org/Collectors/Zope3-dev/544 .

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Corresponds to the version of the zope.schema package shipped as part of
the Zope 3.2.0 release.

Add "iterable" sources to replace vocabularies, which are now deprecated
and scheduled for removal in Zope 3.3.

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Corresponds to the version of the zope.schema package shipped as part of
the Zope 3.1.0 release.

Allow 'Choice' fields to take either a 'vocabulary' or a 'source'
argument (sources are a simpler implementation).

Add 'TimeDelta' and 'ASCIILine' field types.