Add Minimal FastUtil int/long collections.

Importing the full library would double the jar size... its way too large.
So lets just import the basic int/long based collections to then use
to improve performance on these kind of collections.

Spigot-API-Patches/0006-Add-async-chunk-load-API.patch

@@ -0,0 +1,92 @@
+From 410427fe9f7aa75592d7ba4aec7cfc78ae868da7 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Mon, 29 Feb 2016 17:43:33 -0600
+Subject: [PATCH] Add async chunk load API
+
+
+diff --git a/src/main/java/org/bukkit/World.java b/src/main/java/org/bukkit/World.java
+index d088c3c..d16facb 100644
+--- a/src/main/java/org/bukkit/World.java
++++ b/src/main/java/org/bukkit/World.java
+@@ -130,6 +130,78 @@ public interface World extends PluginMessageRecipient, Metadatable {
+     public Chunk getChunkAt(Block block);
+ 
+     /**
++     * Used by {@link World#getChunkAtAsync(Location,ChunkLoadCallback)} methods
++     * to request a {@link Chunk} to be loaded, with this callback receiving
++     * the chunk when it is finished.
++     *
++     * This callback will be executed on synchronously on the main thread.
++     *
++     * Timing and order this callback is fired is intentionally not defined and
++     * and subject to change.
++     */
++    public static interface ChunkLoadCallback {
++        public void onLoad(Chunk chunk);
++    }
++
++    /**
++     * Requests a {@link Chunk} to be loaded at the given coordinates
++     *
++     * This method makes no guarantee on how fast the chunk will load,
++     * and will return the chunk to the callback at a later time.
++     *
++     * You should use this method if you need a chunk but do not need it
++     * immediately, and you wish to let the server control the speed
++     * of chunk loads, keeping performance in mind.
++     *
++     * The {@link ChunkLoadCallback} will always be executed synchronously
++     * on the main Server Thread.
++     *
++     * @param x Chunk X-coordinate of the chunk - (world coordinate / 16)
++     * @param z Chunk Z-coordinate of the chunk - (world coordinate / 16)
++     * @param cb Callback to receive the chunk when it is loaded.
++     *           will be executed synchronously
++     */
++    public void getChunkAtAsync(int x, int z, ChunkLoadCallback cb);
++
++    /**
++     * Requests a {@link Chunk} to be loaded at the given {@link Location}
++     *
++     * This method makes no guarantee on how fast the chunk will load,
++     * and will return the chunk to the callback at a later time.
++     *
++     * You should use this method if you need a chunk but do not need it
++     * immediately, and you wish to let the server control the speed
++     * of chunk loads, keeping performance in mind.
++     *
++     * The {@link ChunkLoadCallback} will always be executed synchronously
++     * on the main Server Thread.
++     *
++     * @param location Location of the chunk
++     * @param cb Callback to receive the chunk when it is loaded.
++     *           will be executed synchronously
++     */
++    public void getChunkAtAsync(Location location, ChunkLoadCallback cb);
++
++    /**
++     * Requests {@link Chunk} to be loaded that contains the given {@link Block}
++     *
++     * This method makes no guarantee on how fast the chunk will load,
++     * and will return the chunk to the callback at a later time.
++     *
++     * You should use this method if you need a chunk but do not need it
++     * immediately, and you wish to let the server control the speed
++     * of chunk loads, keeping performance in mind.
++     *
++     * The {@link ChunkLoadCallback} will always be executed synchronously
++     * on the main Server Thread.
++     *
++     * @param block Block to get the containing chunk from
++     * @param cb Callback to receive the chunk when it is loaded.
++     *           will be executed synchronously
++     */
++    public void getChunkAtAsync(Block block, ChunkLoadCallback cb);
++
++    /**
+      * Checks if the specified {@link Chunk} is loaded
+      *
+      * @param chunk The chunk to check
+-- 
+2.8.0
+