Some cleanup in ImageLoader
Some cleanup in ImageLoader

cnbin/PreloadJS,sokeroner/PreloadJS,CreateJS/PreloadJS,ebabel-eu/PreloadJS,Teino1978-Corp/Teino1978-Corp-PreloadJS,cnbin/PreloadJS,Teino1978-Corp/Teino1978-Corp-PreloadJS,tehvgg/PreloadJS,SpringRoll/PreloadJS,andrew168/PreloadJS,not-only-code/PreloadJS,andrew168/PreloadJS,CreateJS/PreloadJS,dmnsgn/PreloadJS,sokeroner/PreloadJS,tehvgg/PreloadJS,SpringRoll/PreloadJS