Merge branch 'master' into clusterconfig

Conflicts:
	README.md
	src/main/scala/com/signalcollect/DefaultGraph.scala
	src/main/scala/com/signalcollect/Graph.scala
	src/main/scala/com/signalcollect/configuration/KryoInit.scala
	src/main/scala/com/signalcollect/examples/EfficientPageRank.scala
	src/main/scala/com/signalcollect/factory/worker/Akka.scala
	src/main/scala/com/signalcollect/node/DefaultNodeActor.scala
	src/main/scala/com/signalcollect/worker/AkkaWorker.scala