New function: ProxySteerable(), requires ZeroMQ 4.0.5
New function: ProxySteerable(), requires ZeroMQ 4.0.5

pebbe/zmq4,jimenezrick/zmq4,Mustard-Systems-Ltd/zmq4,Mustard-Systems-Ltd/zmq4,jimenezrick/zmq4,pebbe/zmq4,Mustard-Systems-Ltd/zmq4,jimenezrick/zmq4