0.2.1

• Added support for blank node identifiers (Enhancement #6).

0.2.0

• Rewrote serialization/deserialization of references to previously visited objects. Now they are serialized as objects with a single attribute - id. [Bug #3]

0.1.2

• Support for (de)serialization of plain identifier object properties (Enhancement #4).

0.1.1

• Fixed Bug #1.