code: function(separator) {
        var str = this;
        if(separator === undefined) separator = '-';
        if(str.normalize) {
          str = str.normalize();
        }
        str = str.replace(/[^a-z0-9\-_]+/gi, separator)
        if(separator) {
          str = str.replace(new regexp('^{sep}+|{sep}+$|({sep}){sep}+'.assign({ 'sep': escapeRegExp(separator) }), 'g'), '$1');
        }
        return encodeURI(str.toLowerCase());
      }
docs: *
  @method parameterize()
  @returns String
  @short Replaces special characters in a string so that it may be used as part of a pretty URL.
  @example
  
  'hell, no!'.parameterize() -> 'hell-no'
  
  *