update/improve design docs as background info for IO layer, see #2890
Merge pull request #1019 from spray/wip-IO

update/improve design docs as background info for IO layer, see #2890
make ActorRefSpec more deterministic, see #2836
Merge pull request #1016 from maffoo/wip-2898-hwt-fix-mgn

Fix HashedWheelTimer to properly handle timeouts that are multiple of wheel period
Updated Netty to 3.6.1.Final #2715
Merge pull request #1017 from drewhk/wip-2887-tcpmanager-drewhk

Created top level manager for TCP based IO #2887
Merge pull request #1006 from akka/wip-2879-copyright2013-√

 #2879 - updating copyright info
Merge pull request #1022 from drewhk/wip-2715-upgrade-netty-3-6-1-drewhk

Updated Netty to 3.6.1.Final #2715
Fixed issue with Netty not releasing worker threads properly #2733
Publish InstantMemberEvent immediately, see #2803
Incorparate review comments, see #2803
Merge pull request #1015 from akka/wip-2882-deadletter-null-sender-patriknw

Replace noSender in DeadLetterActorRef, see #2882
Merge pull request #1020 from akka/wip-2836-ActorRefSpec-∂π

make ActorRefSpec more deterministic, see #2836
Merge pull request #1024 from drewhk/wip-2733-netty-workerpool-shutdown-drew

Fixed issue with Netty not releasing worker threads properly #2733
Merge pull request #1025 from akka/wip-2803-instant-member-events-patriknw

Publish InstantMemberEvent immediately, see #2803
tcp connection actors, see #2886
tcp selector and listener actors, extension of tcp manager actor, see #2885 and #2887
refactor tests to reuse common connection setup
fix assertion error typo
 Fixed problems handling passive connections in Remoting #2878

- Fixed potential race in EndpointWrite when TakeOff is processed
- Reenabled accidentally disabled gremlin due to changed defaults
- Fixed EndpointRegistry incorrectly handling passive connections