NOTE: it should still work with 1.6+ but you need to replace "minecraft_server.jar" with the latest version from www.minecraft.net/download. Remember to rename the file you downloaded exactly to the old files name
REASON: the crew decided to change the link with every new version... no way to permanently fix it, sorry guys:(

I did some more coding and this is the result:
features:
-generates server.properties
-generates white-list.txt
-generates ops.txt
-downloads minecraft_server.jar from minecraft.net

now, its compatible with 1.3.1 , it will let you choose adventure- and hardcore mode

Now you don't need any tutorials to make your own server anymore!