Added Xmas trees to the canteen and chapel.

Added Xmas and Xmas Eve holiday-features:
>If ALLOW_HOLIDAYS is in config.txt, random (harmless) wrapped presents will be placed under all xmas trees on z-level 1. :3
>Ian will start wearing a santahat
Added content for the end of the Mayan Calander.
Fixed the spelling of -invisible- pens



git-svn-id: http://tgstation13.googlecode.com/svn/trunk@5226 316c924e-a436-60f5-8080-3fe189b3f50e

code/defines/obj/weapon.dm

@@ -1178,12 +1178,16 @@
 
 /obj/item/weapon/a_gift
 	name = "gift"
-	desc = "A gift it appears."
+	desc = "PRESENTS!!!! eek!"
 	icon = 'icons/obj/items.dmi'
 	icon_state = "gift"
 	item_state = "gift"
 	pressure_resistance = 70
 
+/obj/item/weapon/a_gift/New()
+	pixel_x = rand(-10,10)
+	pixel_y = rand(-10,10)
+	return ..()
 
 /obj/item/device/camera_bug
 	name = "camera bug"