Fallback for resizable images for old versions of iOS

UIImage_ResizableFallback.m

- (UIImage *)resizableImageWithInsets: (UIEdgeInsets *)insets
    UIImage *stretchableImage;
    // Current OS Version
    if ([UIImage respondsToSelector:@selector(resizableImageWithCapInsets:)]){
        stretchableImage = [self resizableImageWithCapInsets: insets];
    } else {
        stretchableImage = [self stretchableImageWithLeftCapWidth:insets.left topCapWidth:insets.top];
    }
    return stretchableImage;
}