sudo 6.x-1.1

Release 1.1 adds ability to define default sudo roles -- roles which, whenever granted to a user, will automatically add that user to the sudoers list. It also solves the problem of which roles a user should maintain when being removed from the sudoers list. Also, it ensures that all potential sudo users have their sudo roles when the site goes into maintenance mode, preventing the lockouts that could occur with 1.0. Finally, the button is now themed using CSS3 instead of sliding door images.