Issue fix: preview is blurry on screen with 3x scale (iPhone 6 Plus specific issue)
Issue fix: preview is blurry on screen with 3x scale (iPhone 6 Plus specific issue)

jaybowong/MTBBarcodeScanner,cnbin/MTBBarcodeScanner,mikebuss/MTBBarcodeScanner,mikebuss/MTBBarcodeScanner,Kalvar/MTBBarcodeScanner,myfitnesspal/MTBBarcodeScanner,mikebuss/MTBBarcodeScanner,JeremyPacker/MTBBarcodeScanner,heefan/MTBBarcodeScanner