I am also angry at myself because I am the idiot that didn't make a backup before I loaded the snapshot. Sadly a lot of others probably do it too...
Nice to see it has happened to someone else...
I am extremely pissed. I get that snapshots are going to be buggy, but they should not be able to delete everything in your world. Shame on you Mojang, guess I have to restart EVERYTHING!!!
I had reloaded it like 20 minutes after I fired up the snapshot for the first time.