#3340 - Adding support for 0ms push timeout for blocking mailboxes
Shutdown ordering issue in RemoteDeploymentDeathWatchSpec, see #3334
Remove some unnecessary object creation and switch to HashSet for better performance. See #3308
Hardening of cluster member leaving path, see #3309

* Removed leader commands for Shutdown and Exit
* Member shutdown itself  when it sees itself as Exiting
* Singleton cluster with status Exiting will shutdown itself,
  in case the Exiting gossip never arrives
* Exiting member not part convergence check
* Exiting member is removed by leader (on convergence) when the
  exiting member is in the unreachable set, i.e. sucessfully shutdown
* Reverted the change made for #3266, i.e. Exiting is
  detected as unreachable again.
* Adjust ClusterSingletonManager to new Exiting behaviour
* Fix bug in HeartbeatSender, which caused it to continue to
  send heartbeats to removed nodes, instead of rebalancing
* Refactoring of leaderActions method
* Leaving section in docs
Merge pull request #1441 from akka/wip-3308-actorsystemspec-times-out-ban

ActorSystemSpec timeout fixes #3308
Change defaults for Netty pools, see #3346

server-socket-worker-pool.pool-size-max = 2
client-socket-worker-pool.pool-size-max = 2
Netty 3.6.6, see #3356
Use a dilated timeout for ConcurrentActivationTest. See #3269
Remove auto-join config, derive from seed-nodes, see #3359
Merge pull request #1432 from akka/wip-3309-exiting-patriknw

Hardening of cluster member leaving path, see #3309
Merge pull request #1443 from akka/wip-3359-auto-join-patriknw

Remove auto-join config, derive from seed-nodes, see #3359
Merge pull request #1444 from akka/wip-3334-RemoteDeploymentDeathWatchSpec-patriknw

Shutdown ordering issue in RemoteDeploymentDeathWatchSpec, see #3334
Merge pull request #1436 from akka/wip-3340-0-push-timeout-√

 #3340 - Adding support for 0ms push timeout for blocking mailboxes
Missing barrier coordination in RemoteNodeDeathWatchSpec, see #3350
Merge pull request #1445 from akka/wip-3340-RemoteNodeDeathWatchSpec-patriknw

Missing barrier coordination in RemoteNodeDeathWatchSpec, see #3340
Merge pull request #1447 from akka/wip-3346-netty-defaults-patriknw

Change defaults for Netty pools, see #3346
Merge pull request #1448 from akka/wip-3356-netty-3.6.6-patriknw

Netty 3.6.6, see #3356
Ensure that dispatcher doesn't get empty during test. See #3251
davyJones should be sender, see #3366
Merge pull request #1449 from akka/wip-3269-akka.camel.concurrentactivationtest-failure-ban

Use a dilated timeout for ConcurrentActivationTest #3269