Norman

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*Release Date: 2012-04-20*

- Fixed failing tests
- `!Group.add` implemented and documented
- Missing documentation fixed

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*Release Date: 2012-04-20*

- Exceptions raised by validation errors are now all ValueError
- Group object added to represent sub-collections
- Deletion validation added to tables through `Table.validate_delete`
- Minor documentation updates
- Minor bugfixes

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*Release Date: 2012-04-13*

- First public release, repository imported from private project.