Zombie Fortress 0.3.5 released

Thank you for everyone at Penny-Arcade who helped me test 0.3.3 and further improve the plugin.

- When you are converted into a Zombie, your rag doll no longer changes.
- No longer possible to get negative kills.
- Killing survivors during humiliation no longer transforms them into zombies for next round.
- Zombies now spawn immediately after seeing their kill cam.
- A brand new auto-balancing system is now used that favors survivors.
- Medic's uber charge now only lasts 5 seconds.