code: function crawlHrefs(result, $, endCallback) {
  
      log.debug({"url" : result.url, "step" : "analyzeHTML", "message" : "CrawlHrefs"});
      async.each($('a'), function(a, callback) {
          crawlHref($, result, a, callback);
      }, endCallback);
  
  }
docs: Crawl urls that match to HTML tags a.href found in one page
  
  @param The Http response with the crawl option
  @param the jquery like object for accessing to the HTML tags.
  @param callback()