Hex (AARRGGBB) -> UIColor init

UIColor+Hex

convenience init(hex: String) {
        var rgbValue:UInt32 = 0
        Scanner(string: hex).scanHexInt32(&rgbValue)

        self.init(red: CGFloat((rgbValue & 0x00FF0000) >> 16) / 255.0,
                  green: CGFloat((rgbValue & 0x0000FF00) >> 8) / 255.0,
                  blue: CGFloat(rgbValue & 0x000000FF) / 255.0,
                  alpha: CGFloat((rgbValue & 0xFF000000) >> 24) / 255.0)
    }