Unnecessary state object generation

[hurelhuyag]

I just tried to generate PetClinic project again with latest xoom 1.5.3-SNAPSHOT version and I found this. In this example, PetEntity::register method constructing new PetState object and passing it to PetRegistered event and PetRegistered event object deconstructing it. Instead, PetEntity can just pass values directly to PetRegistered event.

[VaughnVernon]

Thanks @hurelhuyag. I discussed this with @danilo-ambrosio and we decided for now we will keep it this way. We will likely change as you suggested, but for now it is lower priority.