[CameraRoll] Image orientation fix for #1845

Summary:
PR for #1845

Use ALAssetOrientationUp for image orientation.

Originally committed at b34a85f4da
Closes https://github.com/facebook/react-native/pull/2214
Github Author: Adam Roth <adamjroth@gmail.com>

Libraries/Image/RCTImageLoader.m

@@ -103,7 +103,7 @@ static UIImage *RCTScaledImageForAsset(ALAssetRepresentation *representation,
 
   if (imageRef) {
     UIImage *image = [UIImage imageWithCGImage:imageRef scale:scale
-                                   orientation:(UIImageOrientation)representation.orientation];
+                                   orientation:UIImageOrientationUp];
     CGImageRelease(imageRef);
     return image;
   }