tileIdMap now generated using reflection. Also, a method in GameEditorController to get all classes from a package now handles its own exceptions
Merge branch 'towerdefense2.0' of https://github.com/duke-compsci308-spring2013/vooga into towerdefense2.0
Merge branch 'towerdefense2.0' of https://github.com/duke-compsci308-spring2013/vooga into towerdefense2.0
TileFactories now no longer have a getTileId() method, now hold constants instead