Fix incompability with views3

Because of

  function option_definition() {
    $options = parent::option_definition();
    $options['skip_blank'] = array('default' => FALSE);
    // Field element_type and classes cannot be defined in the options
    // definition because the field handlers are not attached when the option
    // defaults are set up in the object's init() method.
    return $options;
  }

the settings are not going into the export. The only possiblity to fix it, is to have semantic_html defined in option_definition. Sure thats a easy fix :)