Changed to use removeAllEventListeners(), minor doc update,
Changed to use removeAllEventListeners(), minor doc update,

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