This is a brute force but simple method - fixes #53

[techman83]

That appears to work consistently on ZMQ 4. Confusingly packaged as:

leon@gandalf:~/git/exobrain$ dpkg -l|grep zmq
ii  libzmq3:amd64                         4.0.4+dfsg-2                  amd64        lightweight messaging kernel (shared library)
ii  libzmq3-dev:amd64                     4.0.4+dfsg-2                  amd64        lightweight messaging kernel (development files)

Added a bit of commentary as well. sleeps are my least favourite way to fix these kinds of things.