When updating view_unpublished permissions, tell user node access permissions need rebuilt

I couldn't get this module to work at all. My steps:

1. Installed module
2. Set desired view_unpublished permissions
3. Try to view unpublished content (doesn't work)

Then I went to the status report page and rebuilt the node access permissions. Now the module works as expected.

To avoid these types of issues, my suggestion is to set a drupal message when any of the view_unpublished permissions are created or updated to tell the user that the node access permissions need rebuilt for the changes to be applied. You can also include a link to the node access permissions section on the status report page.