* also support for serialization of exceptions, see
comment in reference.conf
* extract Throwable and Payload methods to helper classes
* add security checks before creating instance from class name
* placed them in a new section additional-serialization-bindings,
which is included by default when Artery is enabled
* can also be enabled with enable-additional-serialization-bindings
flag to simplify usage with old remoting
* added a JavaSerializable marker trait that is bound to JavaSerializer
in testkit, this can be used in tests so that we eventually can run
tests without the java.io.Serializable binding
This is to ensure Akka Cluster Client will work with Java Serialization turned off.
However for the sake of backward compatibility, the protobuf serialization for `akka.actor.Identify`
and `akka.actor.ActorIdentity` is turned off.
