If you're on a Mac and have no map editor like me, you might need to run custom maps on SC2 and have no way to do it. (No editor = no test document feature).
So, I wrote you a shell script! But then I realized most users have no interest in a shell script. So I wrote you a Java app! The java application is attached below. Just run it and select the map, then hit launch. It's very easy to use.