Merge pull request #369 from Aaronontheweb/akka-cluster

Akka cluster checkin
Merge branch 'akka-cluster' of https://github.com/akkadotnet/akka.net into akka-cluster
Merge branch 'akka-cluster' of https://github.com/Aaronontheweb/akka.net into dev
Port ClusterSpec. Still two failing tests
Merge pull request #3 from smalldave/akka-cluster-clusterspec

Akka cluster clusterspec