Users and servers persistence

A short news about the software itself: we have successfully implemented users and servers persistence in a database, using NoSQL (Redis). Now, you can reboot/restart, you'll never lost your users nor your configured servers. Admin view now have two "pages", Users and Servers Management. Do not forget to log-in before doing these operations, or it won't work.

If you use latest appliance available, it's already included. If you have the previous one, please do a "service xo update" then "service xo restart" to get those features enabled. Enjoy XO!