Changelog 2016-07-11

• Introduced Creep.withdraw method. It replaces all structures’ transfer methods which are now considered deprecated.
• Executing StructureSpawn.createCreep now inserts a new dummy Creep object into Game.creeps hash immediately. The id property of such object is undefined until the next tick.
• Executing Room.createFlag now inserts a new Flag object into Game.flags hash immediately.