code: function crawlLinks(result, $, endCallback) {
  
      if (! result.links){
          return endCallback();
      }
  
      log.debug({"url" : result.url, "step" : "analyzeHTML", "message" : "CrawlLinks"});
  
      async.each($('link'), function(linkTag, callback) {
          crawLink($, result, linkTag, callback);
      }, endCallback);
  }
docs: Crawl link tags found in the HTML page
  eg. : <link rel="stylesheet" href="/css/bootstrap.min.css">
  
  @param The HTTP result with the crawl options
  @param the jquery like object for accessing to the HTML tags.
  @param callback()