Switch PlayerChatEvent to AsyncPlayerChatEvent for bleeding-edge 1.3.1 Bukkit builds to prevent persistent nag from Bukkit, update Bukkit lib

UNTESTED, please confirm working... looks like chat event cancellation might be bugged in Bukkit at the moment but will hopefully be fixed soon if so

src/com/massivecraft/factions/zcore/MPluginSecretPlayerListener.java

@@ -4,7 +4,7 @@ import org.bukkit.Bukkit;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.EventPriority;
 import org.bukkit.event.Listener;
-import org.bukkit.event.player.PlayerChatEvent;
+import org.bukkit.event.player.AsyncPlayerChatEvent;
 import org.bukkit.event.player.PlayerCommandPreprocessEvent;
 import org.bukkit.event.player.PlayerPreLoginEvent;
 
@@ -35,7 +35,7 @@ public class MPluginSecretPlayerListener implements Listener
 	}
 	
 	@EventHandler(priority = EventPriority.LOW)
-	public void onPlayerChat(PlayerChatEvent event)
+	public void onPlayerChat(AsyncPlayerChatEvent event)
 	{
 		if (event.isCancelled()) return;