Remote process communication

[trustmaster]

Once we have a framework to turn a visual graph into a running app, the next step is to let different flow-based apps talk to each other by means of remote ports and connections.

It would be nice to make such communication compatible with NoFlo network protocol noflo/noflo#107, so NoFlo graphs could talk to GoFlow and vice versa.

[mackristof]

Perhaps with GRpc =>https://github.com/grpc/grpc-common/tree/master/go