add controller actions and table methods
add controller actions and table methods

bolshakov/activeadmin_sortable_table,davidyang/activeadmin-sortable,davidyang/activeadmin-sortable,jcgertig/activeadmin-orderable,mvdstam/activeadmin-sortable,jcgertig/activeadmin-orderable,bolshakov/activeadmin_sortable_table,mvdstam/activeadmin-sortable,brightbytes/activeadmin-orderable,bolshakov/activeadmin_sortable_table,brightbytes/activeadmin-orderable,nicday/activeadmin-sortable,nicday/activeadmin-sortable