code: function getIncludedContent(fileName, css) {
        return fs.readFileAsync(dirname + fileName, {encoding: 'utf8'}).then(function(data) {
          if (css && conf.cssUrlReplacer) {
            data = data.replace(cssurl, function(matched, pref, theUrl, suf) {
              //console.log('readFileAsync, css replacer: ' + url + ', ' + theUrl);
              return pref + conf.cssUrlReplacer(theUrl) + suf;
            });
          }
          incfiles[fileName] = data;
        })
        .catch(function(e) {
          // If we can't read the file, just issue a console warning and continue.
          // Content for this file will not be inlined.
          console.warn('Inliner:\n' + e);
        });
      }
docs: /* fetch the content of one local CSS or Javascript file.
  Add the content to the incfiles object.