Entity spawning works.

src/main/java/cpw/mods/fml/server/FMLServerHandler.java

@@ -142,13 +142,6 @@ public class FMLServerHandler implements IFMLSidedHandler
 
     }
 
-    @Override
-    public Entity spawnEntityIntoClientWorld(EntityRegistration er, EntitySpawnPacket packet)
-    {
-        // NOOP
-        return null;
-    }
-
     @Override
     public void adjustEntityLocationOnClient(EntitySpawnAdjustmentPacket entitySpawnAdjustmentPacket)
     {