ZeroMQ dependency

[tokejepsen]

I was wondering whether it would be possible to have ZeroMQ as an optional dependency for distributed processing?

In the industry (vfx and animation) I'm interesting in using pythonflow, ZeroMQ is hard to distribute because of the tools we use.
Further we would probably look at using other processing distribution systems, such as using render manager like Thinkbox.

[tillahoffmann]

Good call, that should have been an optional dependency.

[tokejepsen]

Nice, excellent quick work:-)