Add obfuscation helper patch to assist update process.

By: md_5 <git@md-5.net>

CraftBukkit-Patches/0045-Plug-World-Unload-Memory-Leak.patch

@@ -0,0 +1,22 @@
+From 9cc0ddfa178ec0b0aa06f17da9708cefbffd318a Mon Sep 17 00:00:00 2001
+From: md_5 <md_5@live.com.au>
+Date: Sat, 3 Aug 2013 19:02:59 +1000
+Subject: [PATCH] Plug World Unload Memory Leak
+
+
+diff --git a/src/main/java/net/minecraft/server/BlockRedstoneTorch.java b/src/main/java/net/minecraft/server/BlockRedstoneTorch.java
+index 8e01414..e0469bb 100644
+--- a/src/main/java/net/minecraft/server/BlockRedstoneTorch.java
++++ b/src/main/java/net/minecraft/server/BlockRedstoneTorch.java
+@@ -11,7 +11,7 @@ import org.bukkit.event.block.BlockRedstoneEvent; // CraftBukkit
+ public class BlockRedstoneTorch extends BlockTorch {
+ 
+     private boolean isOn;
+-    private static Map b = new HashMap();
++    private static Map b = new java.util.WeakHashMap(); // Spigot
+ 
+     private boolean a(World world, int i, int j, int k, boolean flag) {
+         if (!b.containsKey(world)) {
+-- 
+1.8.3.2
+