[UPD] Automatic public server, no port forwarding required!

UPD meaning updated, I couldn't fit it on the title, oops.
Updated to include better support for the official Minecraft server and Spigot now that Bukkit has partially died.

I've seen a few topics on the Server Help forum of people having issues with port forwarding, and static IPs and all that stuff.
So here's a script I've made, that's honestly 100% automatic aside from you having to download the server jarfile.
I really mean 100% automatic. You download the script, download the server file and rename the file to minecraft_server.jar, put it in the same directory and when you run the script, it will find your internal IP (so you don't need a static *INTERNAL* IP), and then open port 25565 to that IP, and run the server. Obviously, this uses UPnP, which many programs you have probably use. Skype? That uses UPnP for incoming calls. Bittorrent? That uses it to connect to peers, and well you get the point.

Features:
- Create public servers without port forwarding.
- Support for a wide range of routers.
- Fully automatic, you simply run the script and it does the work.
- Change the port to open instead of 25565 (open settings.bat)
- Very configurable, open settings.bat with notepad and you can change anything from the name of the server file, to using a static IP address!
- Easy to use.
- Supports Spigot (How to get Spigot/CraftBukkit 1.8)

Notes:
So far it's been tested on wireless connections and it worked correctly, however, not tested on Ethernet connections, although it should work.
It's got a configuration too, if you choose to disable it finding your IP address, and have you define it manually.
The official Minecraft server jarfile can be downloaded from https://minecraft.net/download Make sure to click the file ending in .jar! Not the executable (.exe)
Copying any code from the script or cristoph's PortMapper is not allowed.

Downloads:
Dropbox (ad supported link, wait 6 seconds, then click in the top right)
Direct download (no ads)
VirusTotal results for the ZIP file: https://www.virustotal.com/en/url/1d1c45be24c1e3119a1b32de6777f0e1f2d5a262155bc67274018726b5ce1eb1/analysis/1421267033/

Latest update features:
- Set PermGen size in settings.bat, useful for servers with a lot of plugins.
- Made code make sense.
- Simpler support for official server software.
- Fixed download links which were dead for quite a while.

Setup:
1. Download the ZIP file above, and extract it to a folder. This folder will have all of your server files. Make sure you extract "Run Server.bat", "PortMapper.jar" and "settings.bat", these are the three files required to run.

2. Download Spigot, the official Minecraft server jarfile, or Bukkit, save it in the same directory as the script.

3. Rename the server jarfile to "minecraft_server.jar" without quotes. If you choose, you can edit the configuration to use a differently named jarfile.

4. Start the "Start Server.bat" file, and if everything worked, you should have your server running. Set it up like any other server, plugins, mods, anything. And it will be public via your external IP address.

5. Goto https://www.google.com/search?q=what+is+my+ip and copy your external IP. You and whoever you choose to give the IP to will be able to join the server with that address.

Video Tutorial:
This tutorial is made by _Polar_, here, on the PMC forums!
https://www.youtube.com/watch?v=FkDL2C8oIhg
Slightly outdated, but it's literally the same, not much difference.

Issues:
None so far!

If you find any please say so in this thread.

If you're interested in using this practically, I'd suggest setting a static internal IP and editing the configuration to stop it auto finding the internal IP, just for that little more stability .

If you have any issues, PLEASE tell me as I'll try to get them fixed.

Thanks to: cristoph on sourceforge.net for letting me use his PortMapper!