title: ALAssetRepresentation fullResolutionImage's UIImageOrientation is wrong
body: <p>I'm trying to ALAssetLibrary to fetch pictures in Photos app, but recently I found a problem, when I get the CGImageRef from ALAssetRepresentation, the UIImageOrientation is wrong(rotated 90 degree), but when I get width and height from the CGImageRef, they're wrong either, now how could I get the right CGImageRef or use the CGImageRef to create a right UIImage?</p>