implemented ClusterRoutingConfig
Merge pull request #380 from Aaronontheweb/akka-cluster

ClusterHeartBeat implementation
added ClusterRouterSupervisorSpec
Merge pull request #385 from Aaronontheweb/akka-cluster-routers

Akka cluster routers
Merge pull request #396 from Aaronontheweb/akka-cluster

Akka cluster (clean checkin)