Update from upstream SpigotMC

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Bukkit-Patches/0019-Add-support-for-fetching-hidden-players.patch

@@ -0,0 +1,28 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Tux <write@imaginarycode.com>
+Date: Sun, 9 Feb 2014 14:02:11 -0500
+Subject: [PATCH] Add support for fetching hidden players
+
+
+diff --git a/src/main/java/org/bukkit/entity/Player.java b/src/main/java/org/bukkit/entity/Player.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/entity/Player.java
++++ b/src/main/java/org/bukkit/entity/Player.java
+@@ -0,0 +0,0 @@ public interface Player extends HumanEntity, Conversable, CommandSender, Offline
+         {
+             throw new UnsupportedOperationException( "Not supported yet." );
+         }
++
++        /**
++         * Gets all players hidden with {@link hidePlayer(org.bukkit.entity.Player)}.
++         *
++         * @return a Set with all hidden players
++         */
++        public java.util.Set<Player> getHiddenPlayers()
++        {
++            throw new UnsupportedOperationException( "Not supported yet." );
++        }
+     }
+ 
+     Spigot spigot();
+--