Pycerberus

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- Fix installation issue: pycerberus is actually not zip-safe

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- Fix egg file generation: Include all necessary packages in eggs
- added babel support to setup.py
- updated pot file and completed German translation
- fix exception if translations for preferred locale are not available (fall
back to english messages)

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- Fixed bug due to duplicated message in DomainNameValidator/EmailAddressValidator
- Validator can now strip inputs (False by default)
- StringValidator now also treats '' as empty value (as well as None)

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- Python 2.3 compatibility
- Schema can raise error if unknown items are processed
- Basic domain name validator
- Basic email address validator

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- You now can declare custom messages as a class-level dict
- Added interface to retrieve error details from InvalidDataErrors
- Added validation schemas to validate a set of values (typically a web form).
Schemas can also inherit from other schemas to avoid code duplication.
- Validators try to make thread-safety violations obvious
- Nicer API to retrieve error details from an InvalidDataError

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- initial release