Add fallback to use BlobBuilder if Blob constructor is not supported
Add fallback to use BlobBuilder if Blob constructor is not supported

and skip if responseType is already `arraybuffer`.

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