Add an action to show the list of the latest groups

lib/util.php

@@ -945,6 +945,8 @@ function common_fancy_url($action, $args=null)
         return common_path('group/'.$args['nickname'].'/members');
      case 'usergroups':
         return common_path($args['nickname'].'/groups');
+     case 'groups':
+        return common_path('group');
      default:
         return common_simple_url($action, $args);
     }