Added a KnightSprite class
Removed the default scenes and added a GameScene and placeholder graphics
added initWithPosition: for the Knight, and visual logic
Fixed KnightSprite position code
Added visual targets adjacent to the player
Added a superclass Entity
Added health and maxHealth variable to the Entity class.
Added Dwarf Entity
Added DwarfSprite Class, A shameful copy-paste from KnightSprite
Added Entities array and a Dwarf to the game scene