Allow class pets to teleport to their owners.

This closes #497.

changelog.md

@@ -14,6 +14,7 @@ These changes will (most likely) be included in the next version.
 - Like the other user commands, the permission for `/ma ready` now defaults to true. 
 - Unbreakable weapons and armor now use the unbreakable item flag instead of item durability and on-hit repairs. This means that MobArena's unbreakable items are now compatible with plugins that depend on special durability values, such as QualityArmory. 
 - Spectators can no longer take damage when the arena isn't running.
+- Pets can now teleport back to their owners if they get too far away.
 
 ## [0.103] - 2018-08-28
 - It is now possible to add a fixed delay (in seconds) between waves with the new per-arena setting `next-wave-delay`.

src/main/java/com/garbagemule/MobArena/ArenaListener.java

@@ -885,6 +885,9 @@ public class ArenaListener
     }
     
     public void onEntityTeleport(EntityTeleportEvent event) {
+        if (monsters.hasPet(event.getEntity()) && region.contains(event.getTo())) {
+            return;
+        }
         if (region.contains(event.getFrom()) || region.contains(event.getTo())) {
             event.setCancelled(true);
         }