Merge pull request #976 from MarcinSc/develop

Adjusted a bit item in hand display for item with different texture size...
Switched to tera-bullet 1.0.2
Added some protection against previewing the world when no world generator is selected.
Add missing layout-config annotation for column-widths and row-heights
Merge pull request #978 from mkienenb/PR-fix-layout-options

Add missing layout-config annotation for column-widths and row-heights
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
Fixed hashCode for NetEntityRefs.
Merge pull request #979 from MarcinSc/develop

Fixing occasional spawning underground and adding additional method to InventoryManager for comparing items
Added protection from initially falling through the world.
Moved UILoadBar into the standard widgets.
Merge branch 'develop' of git@github.com:MovingBlocks/Terasology.git into develop
Undid change of SpawningClientInfo position away from center of chunk.