Fixes Mechs dieing to Wand of death
Changes simple_animal/Die() because it disagrees with simple_animal/Life() due to the health variable
Removes unnecessary type check from projectiles/projectile/magic.dm death projectile.
Merge pull request #2504 from RobRichards1997/25/01/2014-Magicks-bad

Fixes #2503 - Mechs Vs. Wand of death