New theme "nmnlist"

I've just made a white-over-black variant of theme "mnmlist" (with a few minor changes to suit my taste). Would you like to add it to your repo?

Cheers,
—Tastalian
![screenshot](https://f.cloud.github.com/assets/1189580/280304/12c15560-9151-11e2-86f5-bcb5d6e433be.png)