Support for creature respawn
Merge branch 'master' of https://github.com/ProfAmesBC/Game2013.git
Added support for re-spawn locations in CreatureManager. Needs to be
instantiated in BatsEverywhere. Currently using a queue data structure,
so if a creature dies it should push its original spawn location.
Creature Manager will then pop of its top location and use that to
create a new creature at that spawn location. Currently only supports
Robot but also needs to support mummy and pacman ghost.