Coalaip-bigchaindb

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* Update to comply with BigchainDB 1.0.1 and bigchaindb-driver 0.4.0

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Ups, I forgot something

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Update version of pycoalaip

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Some changes during the OMI hackfest!

* Upgrade bigchaindb and driver's version to match up

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First alpha release on PyPI.

* Upgraded to BigchainDB Server 0.9 (and along with it, bigchaindb-driverv0.2)
* Users are now represented by public/private keypairs instead of
verifying/signing keypairs
* Added support for querying ownership history of an entity
* Added support for entity transfers (and retransfers)
* Added ``is_same_user()``

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* Implemented support for loading persisted Entities from BigchainDB
* Upgraded to bigchaindb-driverv0.1.2