Glowshrooms

Nerfed the spread rate and chance, made the suspectible to plantbgone and acid.
 Arcade
Added a new prize.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@1528 316c924e-a436-60f5-8080-3fe189b3f50e

code/game/objects/glowshroom.dm

@@ -10,10 +10,10 @@
 	layer = 2.1
 	var/endurance = 30
 	var/potency = 30
-	var/delay = 600
+	var/delay = 1200
 	var/floor = 0
 	var/yield = 3
-	var/spreadChance = 80
+	var/spreadChance = 40
 	var/spreadIntoAdjacentChance = 60
 	var/evolveChance = 2