Update from upstream SpigotMC

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Bukkit-Patches/0026-Fix-slow-tab-complete-for-some-commands.patch

@@ -0,0 +1,21 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: md_5 <git@md-5.net>
+Date: Tue, 22 Jul 2014 21:01:32 +1000
+Subject: [PATCH] Fix slow tab complete for some commands.
+
+Use online players instead of offline players, which is very slow.
+
+diff --git a/src/main/java/org/bukkit/command/defaults/WhitelistCommand.java b/src/main/java/org/bukkit/command/defaults/WhitelistCommand.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/command/defaults/WhitelistCommand.java
++++ b/src/main/java/org/bukkit/command/defaults/WhitelistCommand.java
+@@ -0,0 +0,0 @@ public class WhitelistCommand extends VanillaCommand {
+         } else if (args.length == 2) {
+             if (args[0].equalsIgnoreCase("add")) {
+                 List<String> completions = new ArrayList<String>();
+-                for (OfflinePlayer player : Bukkit.getOfflinePlayers()) {
++                for (OfflinePlayer player : Bukkit.getOnlinePlayers()) { // Spigot - well maybe sometimes you haven't turned the whitelist on just yet.
+                     String name = player.getName();
+                     if (StringUtil.startsWithIgnoreCase(name, args[1]) && !player.isWhitelisted()) {
+                         completions.add(name);
+--