Added definition for FACTION_NEUTRAL to Waypoint.lua

diff --git a/Waypoint.lua b/Waypoint.lua
index a626c40..f69713d 100644
--- a/Waypoint.lua
+++ b/Waypoint.lua
@@ -49,6 +49,8 @@ local F = private.filter_flags
 -------------------------------------------------------------------------------
 -- Constants.
 -------------------------------------------------------------------------------
+local FACTION_NEUTRAL		= BFAC["Neutral"]
+
 local C1 = {}
 local C2 = {}
 local C3 = {}