Logo in SVG format.

I've read in the IRC logs that somebody asked for a scalable SVG copy of Nim's logo and decided to do the conversion on my own. My starting point was a .png file created by @PhilipWitte (see http://reign-studios.net/philipwitte/nimrod/new-symbols.png, the third icon from left in the top row). My image is a poor reproduction of the original, but at least it is scalable and might be used as a starting point for something better.

I checked the image on dark and light backgrounds, it should work in both cases.