Plone-supermodel

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Bug fixes:

- tests to ensure schema.Set is serialized consistently (30)

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New features:

- Python 3 compatibility.
[pbauer, davilima6, dhavlik, ale-rt]

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Bug fixes:

- Python3 compatibility with sixer
[ale-rt]

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Bug fixes:

- Fixed typecasting of IChoice based on its vocabulary. 16
[iham]

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Bug fixes:

- Fix issue where supermodel XML choice field parser failed to parse vocabulary
values with separate keys and display titles, because the parser expected
values tag to not have any namespace.
[datakurre]

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Bug fixes:

- Test-Fix: Support latest zope.i18nmessageid.
[jensens]