Major refactoring of RemoteActorRefProvider, remote Routing and FailureDetector, including lots of fixes and improvements.

- Decoupled FailureDetector from Routing by introducing ConnectionManager which uses FailureDetector instead of it being the same thing.
- Added ConnectionManager
- Added LocalConnectionManager
- Added RemoteConnectionManager
- Improved RoutedProps
- Integrated and added configuration for Scatter Gather router
- Added NoOpFailureDetector
-  Misc API and documentation improvements

Signed-off-by: Jonas Bonér <jonas@jonasboner.com>

akka-tutorials/akka-tutorial-second/src/main/scala/Pi.scala

@@ -9,7 +9,7 @@ import akka.event.EventHandler
 import System.{ currentTimeMillis ⇒ now }
 import akka.routing.Routing.Broadcast
 import akka.actor.{ Timeout, Channel, Actor, PoisonPill }
-import akka.routing.{ RoutedProps, Routing }
+import akka.routing._
 
 object Pi extends App {
 
@@ -53,7 +53,9 @@ object Pi extends App {
     val workers = Vector.fill(nrOfWorkers)(actorOf[Worker])
 
     // wrap them with a load-balancing router
-    val router = Routing.actorOf(RoutedProps().withConnections(workers).withRoundRobinRouter, "pi")
+    val router = Routing.actorOf(RoutedProps(
+      routerFactory = () ⇒ new RoundRobinRouter,
+      connectionManager = new LocalConnectionManager(workers)), "pi")
 
     // phase 1, can accept a Calculate message
     def scatter: Receive = {