anchor.diff:  
   mixin button-group(options)
       //- @FIXME data redefine options structure
  +    - options['id']           = options.id   || ''
       - options['data']         = options.data || []
       - options['selectedData'] = options.selectedData || []
       - options['buttons']      = options.buttons || []
       - options['classes']      = options.classes || ''
       - if(options.buttons.length > 0 && options.classes.indexOf('justified') < 0) options.classes = options.classes + ' btn-group-justified'
  -    div(class='btn-group btn-group-#{options.size} #{options.classes}')
  +    div(id='#{options.id}', class='btn-group btn-group-#{options.size} #{options.classes}')
           block
  
positive.code:     - options['priority'] =                  options.priority || 'default';
      - options['id']       =                  options.id       || '';
      - options['target']   =                  options.target   || '';
      - options['size']     =                  options.size     || 'md';
      - options['navbar']   =                  options.navbar   || false;
      - options['block']    =                  options.block    || false;
  
negative.code:     - if (options.navbar)                    options.classes  = options.classes + ' navbar-btn ';
      - if (options.block)                     options.classes  = options.classes + ' btn-block ';
      - if (options.simple)                    options.classes  = options.classes + ' emil-btn-simple ';
      .emil-btn(class='emil-btn-#{options.size} #{options.classes} #{options.priority} ', id='#{options.id}', data-target="#{options.target}", data-toggle="#{options.toggle}")
          block
  
  mixin button-loader
  