wrap up local routing

- pull some more generic stuff out of the individual routers, add
  factories which take only target lists
- add router parsing to Deployer, removing everything which is not
  strictly related to local scope, which left only few things, so move
  them to Deployer.scala and delete DeploymentConfig
- fix ConfiguredLocalRoutingSpec to use the new configuration mechanism
  and verify that configuration overrides code
- fix DeployerSpec by using (mostly) correct lookup paths and removing
  everything which was not local
- change config file layout, removing everything which is not local from
  akka-actor/.../reference.conf, putting the remote stuff into the
  akka-remote/.../reference.conf (unused as of yet); adapt comments
  according to changed functionality

akka-remote/src/main/scala/akka/remote/RemoteActorRefProvider.scala

@@ -87,7 +87,7 @@ class RemoteActorRefProvider(
        */
 
       @scala.annotation.tailrec
-      def lookupRemotes(p: Iterable[String]): Option[DeploymentConfig.Deploy] = {
+      def lookupRemotes(p: Iterable[String]): Option[Deploy] = {
         p.headOption match {
           case None           ⇒ None
           case Some("remote") ⇒ lookupRemotes(p.drop(2))
@@ -104,7 +104,7 @@ class RemoteActorRefProvider(
       })
 
       deployment match {
-        case Some(DeploymentConfig.Deploy(_, _, _, _, RemoteDeploymentConfig.RemoteScope(address))) ⇒
+        case Some(Deploy(_, _, _, _, RemoteScope(address))) ⇒
           if (address == rootPath.address) local.actorOf(system, props, supervisor, path, false)
           else address.parse(remote.transports) match {
             case Left(x) ⇒