code: function titlecase() {
    return function(data, render) {
      var text = render(data);
      if (text.length === 0) {
        return text;
      }
  
      return text[0].toUpperCase() + text.substring(1);
    };
  }
docs: Mustache lambda that upercase the first letter
  of each word in the given data.
  
  @return {function} the titlecase helper function