Fix for cancelling image loads.
Fix for cancelling image loads.

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