Starts a Play server using Akka HTTP.
Knows how to create an AkkaHttpServer.
Conversion of Enumerators into Akka Streams objects.
Conversion of Enumerators into Akka Streams objects. In the future
this object will probably end up in the Play-Streams module or in
its own module, and we will probably add native Akka Streams support
rather than going via Reactive Streams objects. However the Akka
Streams API is in flux at the moment so this isn't worth doing yet.