/// <summary>
/// Add crawler step process synchronously.
/// </summary>
/// <param name="crawler">Crawler for which start crawling.</param>
/// <param name="uri">Url to crawl</param>
/// <param name="depth">Depth of the url</param>
public static void Crawl(this ICrawler crawler, string uri, int depth)
{
crawler.AddStep(new Uri(uri), depth);
}