=act #3593 Turn of serialize-messages and make receive polymorphic
=clu #3498 Optimize ClusterHeartbeatSender
!clu #3599 Use counter in VectorClock

* No reason to use the System.currentTimeMillis base
* Remove the global VectorClock counter completely,
  current count for a node is in the VectorClock itself
=clu #3603 Handle removed member in Gossip and Reachability merge

* It was a regression introduced in dc9fe4f
* Two problems:
  1) Gossip merge could pop back removed member (was previously
     covered by the filter of unreachable)
  2) Reachability merge didn't handle all cases for removed member,
     i.e. when node not in allowed set
Merge pull request #1717 from akka/wip-3593-some-changes-to-tell-throughput-microbenchmark-ban

=act #3593 Turn of serialize-messages and make receive polymorphic
Merge pull request #1731 from akka/wip-3603-ClientDowningNodeThatIsUnreachableSpec-patriknw

=clu #3603 Handle removed member in Gossip and Reachability merge
Merge pull request #1726 from akka/wip-3498-optimize-heartbeat-sender-patriknw

=clu #3498 Optimize ClusterHeartbeatSender
Merge pull request #1722 from akka/wip-3599-vclock-counter-patriknw

!clu #3599 Use counter in VectorClock
=per #3615 Fix InvalidActorNameException in persistence tests

- use overridden processor and channel ids
- no need anymore to wait for processor instances to stop
- unrelated: fix wrong artifact names in documentation
Merge pull request #1736 from eligosource/wip-3615-fix-invalid-actor-name

#3615 InvalidActorNameException in persistence tests fixed