Switched to tera-bullet 1.0.2
Added some protection against previewing the world when no world generator is selected.
Reworked the handling of entity equality and hashcode, particularly around NetEntityRef. Equality and hashcode are now fixed on entity ref creation. To support net entities on the client side (that can enter and leave relevence), the entity manager now produces entity refs using a RefStrategy, that will always create NetEntityRefs for entities with a NetworkComponent.
Merge branch 'develop' of git@github.com:MovingBlocks/Terasology.git into develop