Add ZeroMQ Plugin message format as json-schema
Add ZeroMQ Plugin message format as json-schema

Add ZeroMQ Plugin message format as [json-schema][1] (inspired by
[IPython messaging format][2]).

[1]: https://python-jsonschema.readthedocs.org/en/latest/
[2]: http://jupyter-client.readthedocs.org/en/latest/messaging.html#messaging

wheeler-microfluidics/zmq-plugin