Added config option ContactMojangServers which disables player skins, but stops the plugin from pinging Mojang servers.

Added reload command to reload the config.
Tweaked a couple of things.
Fixed isInvulnerable issue.

src/main/java/me/libraryaddict/disguise/commands/UndisguiseEntityCommand.java

@@ -1,6 +1,7 @@
 package me.libraryaddict.disguise.commands;
 
 import me.libraryaddict.disguise.DisguiseListener;
+import me.libraryaddict.disguise.LibsDisguises;
 
 import org.bukkit.ChatColor;
 import org.bukkit.command.Command;
@@ -8,11 +9,6 @@ import org.bukkit.command.CommandExecutor;
 import org.bukkit.command.CommandSender;
 
 public class UndisguiseEntityCommand implements CommandExecutor {
-    private DisguiseListener listener;
-
-    public UndisguiseEntityCommand(DisguiseListener listener) {
-        this.listener = listener;
-    }
 
     @Override
     public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
@@ -21,7 +17,7 @@ public class UndisguiseEntityCommand implements CommandExecutor {
             return true;
         }
         if (sender.hasPermission("libsdisguises.undisguiseentity")) {
-            listener.setDisguiseEntity(sender.getName(), null);
+            LibsDisguises.instance.getListener().setDisguiseEntity(sender.getName(), null);
             sender.sendMessage(ChatColor.RED + "Right click a disguised entity to undisguise them!");
         } else
             sender.sendMessage(ChatColor.RED + "You are forbidden to use this command.");