Fix deprecations use in the Remoting and Supervision Java Examples on the Main Page

The Remoting and Supervision Java Examples on the Main Page use a deprecated Props constructor
http://doc.akka.io/japi/akka/2.2.3/akka/actor/Props.html#Props(akka.actor.UntypedActorFactory)

This commit makes use of the Props.create(java.lang.Class, java.lang.Object...) static method
http://doc.akka.io/japi/akka/2.2.3/akka/actor/Props.html#create(java.lang.Class,%20java.lang.Object...)