function parseLittleEndian(hex) {
        var result = 0,
            pow = 0;

        while (hex.length > 0) {
            result += parseInt(hex.substring(0, 2), 16) * Math.pow(2, pow);
            hex = hex.substring(2, hex.length);
            pow += 8;
        }

        return result;
    }
EXIF image data parser.  Currently only parses the Orientation tag value,
but this may be expanded to other tags in the future.

@param fileOrBlob Attempt to parse EXIF data in this `Blob`
@constructor