Coalaip

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Some changes during the OMI hackfest!

* Make creation of Work and Copyright optional when registering
a Manifestation.

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Some changes during the OMI hackfest!

Some highlights:

* Add `register_work` method to enable registering a work without
necessarily registering a manifestation.

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First alpha release on PyPI.

Additional features added with no backwards-incompatible interface changes.
COALA IP models are backwards-incompatible to previous versions due to upgrades
related to spec changes.

Some highlights:

* Queryability of an Entity's ownership history and current owner
* Entities can be given a custom ``id``
* Additional sanity checks employed when deriving Rights, to ensure that a
correct source Right and current holder are given
* Update COALA IP models to latest spec
* Added usage documentation

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Lots of changes and revisions from 0.0.1.dev2. Totally incompatible from
before.

Some highlights:

* Implemented Rights derivation (from existing Rights and Copyrights)
* Implemented Rights transfers
* Entities are now best-effort immutable
* Support for loading Entities from a connected persistence layer

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* Fix packaging on PyPI

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* Development (pre-alpha) release on PyPI.