code: public static function icon($glyph, $options = [])
      {
          Ui::addCssClasses($options, ['icon', $glyph]);
          return Ui::tag('i', '', $options);
      }
docs: Renders an [icon tag](http://semantic-ui.com/elements/icon.html)
  
  @param string $glyph the name of the icon to render -ie "cloud"
  @param array $options the tag options in terms of name-value pairs
  
  @return string the generated icon tag