Tinble: A better simpler guestbook and i18n

Up until now, Tinble included a simple guestbook that I shamelessly borrowed from the flat-file-guestbook repository. It wasn't exactly what I wanted, but I reasoned it was better than nothing. The other day, I stumbled upon this guestbook project, and I liked what I saw. It didn't take me long to integrate it into Tinble.

I also started working on adding support for internationalization courtesy of the php-i18n class.