Add leiningen project file for leiningen toolchains.

I really like your work with FFTs and overtone as I am interested in learning more about FFT and find the combination of overtone life-synthesis and visualization of code really appealing. It took me some time to find this development branch for your blog post, since the master branch doesn't have the code to the blog post in it. I have added a leiningen file to make it easy to experiment, but now it seems I have hit a bug within the JVM/JFrame implementation. http://paste.ubuntu.com/6762781/ I don't have the time right now, but if you need more information, ping me. I might have look into it in the future.