support request #528548 by kyutums: Added page visibility settings. Now you can specify to activate Better Messages only at certain pages. This means that if Better Messages are not active at pages 'admin/*', you will keep seeing the default Drupal messages!
- Now Better Messages CSS and JS files are loaded only required.
- Other minor tweaks and updates.

bug report #526408 by ambo: Changed the path to admin/settings/better-messages, and changed the access arguments to administer site config. Which is more logical!