Simple changes to track new ocaml-zmq API
Simple changes to track new ocaml-zmq API

douglas-larocca/iocaml,douglas-larocca/iocaml,andrewray/iocaml,douglas-larocca/iocaml,douglas-larocca/iocaml,andrewray/iocaml,andrewray/iocaml,andrewray/iocaml