Cheridan's totally sweet Bag of Holding sprites added.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@1198 316c924e-a436-60f5-8080-3fe189b3f50e

code/game/objects/storage/backpack.dm

@@ -68,6 +68,7 @@
 	name = "Bag of Holding"
 	desc = "A backpack that opens into a localized pocket of Blue Space."
 	origin_tech = "bluespace=4"
+	icon_state = "holdingpack"
 
 	New()
 		..()
@@ -120,3 +121,4 @@
 			for (var/obj/O in src.contents) //it broke, delete what was in it
 				del(O)
 			crit_fail = 1
+			icon_state = "brokenpack"