code: function munge(str, options) {
  
      var aMunged = [];
      var aChars, i;
  
      //  initialize default options
      options = options || {};
  
      if (options.encoding) {
          // validate encoding option
  
          if (encoder.TYPES.indexOf(options.encoding) < 0)
              throw Error('Invalid encoding option given: ' + options.encoding);
      } else
          options.encoding = encoder.DEFAULT;
  
      if (str) {
  
          aChars = str.split('');
  
          for (i in aChars)
              aMunged[i] = '&#' + encoder[options.encoding](aChars[i]) + ';';
      }
  
      return aMunged.join('');
  }
docs: the one and only public function of this module. It takes any string and munges
  it according to the options. By default it uses a random encoding.
  
  
  @param {String} str any string to munge, for example 'spacemonkey@moon.com'
  @param {Object} options for munging
  @param options.encoding can be 'ascii', 'utf8' or 'random' (default)
  @return {String} the munged string
  @api public