Allowing monsters to hurt claimed villagers.

src/me/ryanhamshire/GriefPrevention/EntityEventHandler.java

@@ -661,6 +661,12 @@ class EntityEventHandler implements Listener
                     //if attacker isn't a player, cancel
                     if(attacker == null)
                     {
+                        //exception case
+                        if(event.getEntity() instanceof Villager && damageSource != null && damageSource instanceof Monster)
+                        {
+                            return;
+                        }
+                        
                         event.setCancelled(true);
                         return;
                     }