Revert last commit (it was bad decision).
Just for a demo make Hello seriazlizable, wrote HelloSerializer, Serializer and Serializers.
Serializers were used in OutgoingMessageListener.
Test HelloCommandSender can successfully send serialized Hello to tcp-rest server and it can deserialize it.
Serialization stuff moved from as.sparkanta.device.message to as.sparkanta.device.message.serialize.
Deserializers moved from as.sparkanta.device.message to as.sparkanta.device.message.deserialize.
Deserializator(s) renamed to deserializer(s).