new towers
Merge branch 'towerdefense' of https://github.com/duke-compsci308-spring2013/vooga into towerdefense
tower merge conflicts
Merge branch 'towerdefense' of https://github.com/duke-compsci308-spring2013/vooga into towerdefense
Added aura tower example
Merge branch 'towerdefense' of https://github.com/duke-compsci308-spring2013/vooga into towerdefense