New features. Messages for multiple roles, and for admin pages.

Some new features. Created 2 new textarea on the settings page:
Access Denied Message for pages other than nodes - message that displays when user have no access to any admin or other page.
Access Denied Message for multiple roles - message that displays when user may have more than one role for view page. (I can create this as optional)

A lot of corrections based on Drupal coding standards