The mega cruft proxy PR (#974)

* the mega cruft proxy PR

* Rename broker id

* add protocol=grpc

* fix compilation breaks

* Add the tunnel broker to the network

* fix broker id

* continue to be backwards compatible in the protocol

server/server.go

@@ -29,15 +29,26 @@ type Server interface {
 
 // Router handle serving messages
 type Router interface {
+	// ProcessMessage processes a message
+	ProcessMessage(context.Context, Message) error
 	// ServeRequest processes a request to completion
 	ServeRequest(context.Context, Request, Response) error
 }
 
 // Message is an async message interface
 type Message interface {
+	// Topic of the message
 	Topic() string
+	// The decoded payload value
 	Payload() interface{}
+	// The content type of the payload
 	ContentType() string
+	// The raw headers of the message
+	Header() map[string]string
+	// The raw body of the message
+	Body() []byte
+	// Codec used to decode the message
+	Codec() codec.Reader
 }
 
 // Request is a synchronous request interface