work around epoll() bug, see #3176

√: Removing selectNow and select(timeout) from Akka IO config to use only unbounded selects
RK: rebase it onto current master and remove AkkaSelector verbiage
removed calls to deprecated Props constructor in java code
Enable usage of MultiJvm nrOfNodes in cluster StressSpec, see #2787

* Adjustments to StressSpec for testing large clusters
* Performance improvement of mute deadLetters
Quick fix for unreachable exiting, see #3266
Additional tests of ClusterMessageSerializer
Reduce amount of gossip data transferred in idle cluster, see #3279

* When seen same the gossip chat is initated with GossipStatus
  message containing the vclock only
* Remove conversation flag in GossipEnvelope
* Ordinary tell instead of actorSelection when replying
Move barriers of conditional tests in StressSpec, see #2787
fixed indentation
[docs] fix there -> their in two places.
improve logging in {Tcp,Udp}Listener, see #3305

- do not log success message when bind fails
- use real port (and not zero if that was given) in further logging
Merge pull request #1381 from akka/wip-2787-cluster-stress-patriknw

Prepare Cluster StressSpec for heavy testing, see #2787
Remove duplicates in roleMapping, see #3270
Merge pull request #1355 from akka/wip-3176-work-around-epoll-bug-√

 #3176 - Adding an AkkaSelector that will work around the EPoll bug, as ...
Merge pull request #1394 from drexin/wip-drexin-remove-deprecated-props-calls-java

removed calls to deprecated Props constructor in java code
Merge pull request #1393 from CodeBlock/grammarfix

[docs] fix there -> their in two places.
Enforce mailbox types on System actors. See #3273
Merge pull request #1398 from akka/wip-3305-IO-bind-∂π

improve logging in {Tcp,Udp}Listener, see #3305
Merge pull request #1386 from akka/wip-3270-roles-cluster-serializer-patriknw

Remove duplicates in roleMapping, see #3270
Merge pull request #1378 from akka/wip-3273-enforce-mailbox-types-on-system-actors-ban

Enforce mailbox types on System actors. #3273