Martian Zombies update

There's been a minor update to Martian Zombies. Actually, very little has changed. I've just combined everything into one PDF file and added a new page of figures containing three sets of survivors, and another twelve zombies. This way you don't have to print the survivors page twice and end up with spare counters. Combining everything into the one PDF file means you can now get previews on RPGNow! and I've also added some images to the listing over there to show what the game looks like in play.