fixes scaffolding: menu = path

The generator is generating "menu" instead of "path".
I commit this fix here and not on the generator, because it seems to me that `menu` is much clear than `path`, but we need to keep the support for old versions.

```js
  Investor.menus.add({
    title: 'investors manage',
    link: 'investors.admin',
    icon: 'mean-admin/assets/img/icons/settings.png',
    roles: ['admin'],
    menu: 'admin'
  });
  ```