riot shield nerf, also blocks spit. four in armory, one in hos locker, orderable from QM

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@192 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/mob/living/carbon/alien/humanoid/alien_powers.dm

@@ -66,6 +66,12 @@ Also perhaps only queens can do that?
 				if (get_dist(A,M) == 0)
 					for(var/mob/O in viewers(src, null))
 						O.show_message(text("\green <B>[src] has spat at [M.name]!</B>"), 1)
+					if (!istype(M:l_hand, /obj/item/weapon/shield/riot) && prob(50))
+						del(A)
+						return
+					if (!istype(M:r_hand, /obj/item/weapon/shield/riot) && prob(50))
+						del(A)
+						return
 					M.weakened += 5
 					M.fireloss += 10
 					del(A)

code/modules/mob/living/carbon/human/human.dm

@@ -223,7 +223,7 @@
 							d = d / 2
 						d = d / 5
 		if (istype(src.r_hand, /obj/item/weapon/shield/riot))
-			if (prob(70))
+			if (prob(90))
 				show_message("\red Your shield absorbs the blow!", 4)
 				return
 			else
@@ -234,7 +234,7 @@
 					d = d / 5
 		else
 			if (istype(src.l_hand, /obj/item/weapon/shield/riot))
-				if (prob(70))
+				if (prob(90))
 					show_message("\red Your shield absorbs the blow!", 4)
 					return
 				else