Wiki changes

As some of you might have noticed, i made some structural changes to the Wiki and added a couple of new features.
For example, you can now include youtube videos (as can be seen on the Milkscanner Demo page) or a Google Calendar (on the Event Calendar page) - where you can see what i am up to (read: Workshops, Talks, Events) - Moviesandbox wise.
I also started to use categories and restructured the tutorials section a bit.
Unfortunately, i had to add a couple of Anti-Spamming measures, so please let me know if you feel comfortable with the extra stuff.
Oh, and by the way, a good place to post your problems/findings with Moviesandbox is the Bugs' Discussion page. That way, everyone can join in the discussion...