Migration to 0.9 streams API.

Please check over particularly with respect to correctly closing the resources and shutting down the actor system.
I did it this way deliberately to show the alternative using the ForeachDrain explicitly in this case - I will add a comment to the effect that the foreach(println) could be used instead, but this is the long-hand form of it. The foreach is demonstrated in one of the other examples and I wanted to cover both.