remove ActorRef.address & ActorRef.name

- address => path.toString
- name => path.name
- forward hashCode, equals and compareTo to path
- implement recursive efficient ActorPath.compareTo
- fix ActorPath.equals endless recursion
- remove wrong warning in ActorCell.systemInvoke.supervise()

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

@@ -256,12 +256,12 @@ class Gossiper(remote: Remote) {
           log.error(cause, cause.toString)
 
         case None ⇒
-          val error = new RemoteException("Gossip to [%s] timed out".format(connection.address))
+          val error = new RemoteException("Gossip to [%s] timed out".format(connection.path))
           log.error(error, error.toString)
       }
     } catch {
       case e: Exception ⇒
-        log.error(e, "Could not gossip to [{}] due to: {}", connection.address, e.toString)
+        log.error(e, "Could not gossip to [{}] due to: {}", connection.path, e.toString)
     }
 
     seeds exists (peer == _)