Added a stress test.

Commented out, takes too many resources for our CI system.
Faster idle/termination detection.
Merge branch 'master' into scala-2.11-akka-2.3.2-migration
Only sending status when idle.
Akka per-sender FIFO obsoletes a check.
Akka per-sender FIFO obsoletes a check.
Added throttling support to scheduler.
Moved node related things to appropriate packages.
Renamed the file back to DefaultNodeActor.
Removed receive timeout on node actor.
Ground work for partial idle detection on nodes.
Tracking number of workers on node.
Doing idle detection indirectly via nodes.

This lessens the amount of status messages that the coordinator has to
handle.
Made eager idle detection configurable.
Efficient PR works with message serialisation.

This should help with distributed debugging.
Merge remote-tracking branch 'origin/scala-2.11-akka-2.3.2-migration' into clusterconfig
Merge branch 'master' into merge-master-to-migration

Conflicts:
	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/nodeprovisioning/DefaultNodeActor.scala
	src/main/scala/com/signalcollect/nodeprovisioning/Node.scala
	src/main/scala/com/signalcollect/nodeprovisioning/local/LocalNodeProvisioner.scala
	src/test/scala/com/signalcollect/features/ComputationTerminationSpec.scala
resolved all conflicts
Merge branch 'merge-master-to-migration' into clusterconfig