Update from upstream SpigotMC

Upstream merge (we must go deeper) SpigotMC/Spigot@1e7bc383c3

CraftBukkit-Patches/0100-Unfinalize-the-isDisconnected-method-by-bukkit.patch

@@ -0,0 +1,21 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: hcherndon <hcherndon@gmail.com>
+Date: Sat, 15 Feb 2014 01:51:20 -0600
+Subject: [PATCH] Unfinalize the isDisconnected() method by bukkit.
+
+This would literally mean the world to me. You have no idea how much this method being final is fucking me over right now. (Working with NPC's and what not.)
+
+diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/PlayerConnection.java
++++ b/src/main/java/net/minecraft/server/PlayerConnection.java
+@@ -0,0 +0,0 @@ public class PlayerConnection implements PacketPlayInListener {
+     }
+ 
+     // CraftBukkit start - Add "isDisconnected" method
+-    public final boolean isDisconnected() {
++    public boolean isDisconnected() {
+         return !this.player.joining && !NetworkManager.a(this.networkManager).config().isAutoRead();
+     }
+     // CraftBukkit end
+--