Upgrade to Akka 2.3.2
Akka 2.3.4 migration.
Commented out I/O worker pool size experiment.

Left in the netty buffer settings.
Experiment was motivated by:
https://github.com/akka/akka/commit/c640f4a0dd8f5a2afc4865796846c02b5103
5d38
Upgrade to scala 2.11, akka 2.3.2. Replace lift-json with json4s.
Updated Travis.CI to Scala 2.11
Showing build status of master branch.
Disabled logging via coordinator.
Logging in vertices/edges only if actor system is called "SignalCollect"
Allowing to run S/C on existing actor systems.

Fixes issue #151
Removing config entry for pinned dispatcher.

We’re using the one from IO now.
Updated to Scala 2.11.1 and Akka 2.3.3
Merge branch 'master' into scala-2.11-akka-2.3.2-migration
Updated Travis.CI Scala version.
Avoiding serialisation of config.

It may now contain an actor system, which is not serialisable.
Merge branch 'master' into scala-2.11-akka-2.3.2-migration
Merge branch 'master' into scala-2.11-akka-2.3.2-migration

Conflicts:
	README.md
	build.sbt
	src/main/scala/com/signalcollect/configuration/AkkaConfig.scala
	src/main/scala/com/signalcollect/configuration/GraphConfiguration.scala
	src/main/scala/com/signalcollect/configuration/KryoInit.scala
	src/main/scala/com/signalcollect/factory/worker/Akka.scala
	src/main/scala/com/signalcollect/node/DefaultNodeActor.scala

src/main/scala/com/signalcollect/nodeprovisioning/local/LocalNodeProvisi
oner.scala
	src/main/scala/com/signalcollect/util/AkkaRemoteAddress.scala

src/test/scala/com/signalcollect/features/ComputationTerminationSpec.sca
la
Newer Kryo version.
Added Akka default logger.
Fixed Akka system init priorities.

DefaultGraph will now still use a system stored inside the registry. I
still want to get rid of this global thing, but unfortunately it is
convenient here and seems to be the only memory-efficient way to do
logging from inside the vertices (without cluttering up the API by
passing loggers everywhere).
Failed attempts to increase remote throughput.