clarify `sender` in preRestart, see #2509

also remove one warning about io-old.rst not being included in any
toctree
Add multi-node-testkit to the project aggregate. See #3090
Add logging intro, see #2737
(cherry picked from commit 5fcde199d818e22e6dad4aa70f351a52cefe446f)

Conflicts:

	akka-docs/rst/java/logging.rst
	akka-docs/rst/scala/logging.rst
Make RandomRoutedRemoteActorSpec lucky, see #3061

* The failure was probably because of bad luck that no
  message was routed to one routee (unlikely things happen).
Problem with address already in use in udp tests, see #3084

* Subsequent bind to dynamic port might result in same port if
  the socket is closed inbetween
Merge pull request #1185 from drewhk/wip-2297-lifecycle-patterns-forwardport-drewhk

Added patterns for initialization for Scala #2297 (forward-port)
document availability of `sender` in supervisorStrategy
Fixed broken old-io spec (due to l10n of exception msg)
Merge pull request #1181 from akka/wip-3061-RandomRoutedRemoteActorSpec-patriknw

Make RandomRoutedRemoteActorSpec lucky, see #3061
Merge pull request #1184 from akka/wip-3084-udp-bind-patriknw

Problem with address already in use in udp tests, see #3084
Merge pull request #1188 from akka/wip-2737-logging-intro-master-patriknw

Add logging intro, see #2737
Timing issue in TypedActorSpec, see #3085

* Increased the margin
* TimingTest
Merge pull request #1189 from drewhk/wip-fix-old-io-l10n-drewhk

Fixed broken old-io spec (due to l10n of exception msg)
Merge pull request #1186 from akka/wip-2509-sender-preRestart-∂π

clarify `sender` in preRestart, see #2509
Merge pull request #1191 from akka/wip-3085-TypedActorSpec-patriknw

Timing issue in TypedActorSpec, see #3085
Make LoggingReceive docs more obvious. Fixes #3094
Defining vocabulary in the introduction pages #2229
(cherry-picked from 1ce6bb8)
Merge pull request #1196 from drewhk/wip-2229-vocabulary-fwport-drewhk

Defining vocabulary in the introduction pages #2229
Merge pull request #1187 from akka/wip-3090-add-multi-node-testkit-to-aggregate-ban

Add multi-node-testkit to the project aggregate. See #3090
Removed blocking code from TcpConnectionSpec #3064