code: function(spec) {
      var self = this
      if (Array.isArray(spec)) {
        return spec.reduce(function (result, element) {
          return result.concat(self._loadCertificates(element))
        }, [])
      } else if (fs.statSync(spec).isDirectory()) {
        // Be sure to load only files and symlinks, don't recurse down directories
        return self._loadCertificates(
          fs.readdirSync(spec).map(function (f) {
            return path.join(spec, f)
          }).filter(function (f) {
            return fs.statSync(f).isFile()
          })
        )
      } else {
        return fs.readFileSync(spec)
      }
    }
docs: ***************************************************************************
  @method _loadCertificates
  @description Reads all certificates in a number of directories and concatenates
  them into a single string
  @param {Array|string} spec -- An array of filesystem paths for directories
  containing certificates or the certificates
  themselves, or a single path for a directory or
  certificate
  @returns {string}