namespaceFor is used for actor path, topicFor is for mediator topic.
Merge branch 'master' of github.com:wandoulabs/spray-socketio

Conflicts:
	src/main/scala/spray/contrib/socketio/LocalConnectionActive.scala
	src/main/scala/spray/contrib/socketio/examples/SimpleClusterServer.scala
	src/main/scala/spray/contrib/socketio/examples/benchmark/SocketIOClusterTestServer.scala
	src/main/scala/spray/contrib/socketio/namespace/ClusterNamespace.scala
	src/main/scala/spray/contrib/socketio/namespace/LocalNamespace.scala
	src/main/scala/spray/contrib/socketio/namespace/Namespace.scala