Fix up the http broker so it works concurrently and pubs async

examples/client/main.go

@@ -125,6 +125,10 @@ func pingPong(i int) {
 
 func main() {
 	cmd.Init()
+
+	fmt.Println("\n--- Publisher example ---\n")
+	pub()
+
 	fmt.Println("\n--- Call example ---\n")
 	for i := 0; i < 10; i++ {
 		call(i)
@@ -136,6 +140,4 @@ func main() {
 	fmt.Println("\n--- Ping Pong example ---\n")
 	pingPong(10)
 
-	fmt.Println("\n--- Publisher example ---\n")
-	pub()
 }