Work on NPC clowns for the clown planet away mission.

They start peaceful, but attacking them causes them to attack you like a carp.

Attacking a clown will also make all other clowns that can see the attack hostile.

If a clown sees a clown attacking someone, they'll join in the attack

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@4711 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/mob/mob_helpers.dm

@@ -75,6 +75,11 @@
 		return 1
 	return 0
 
+/proc/isclown(A)
+	if(istype(A, /mob/living/simple_animal/clown))
+		return 1
+	return 0
+
 /proc/isAI(A)
 	if(istype(A, /mob/living/silicon/ai))
 		return 1