Added a line to set scaling mode before applying the image, to the only reasonable value - "scaled." It will stretch to fit screen while maintaining aspect ratio and will place one copy of the image on each monitor with multimon. "Spanned" would be better to stretch the image across monitors, but this affects aspect ratio when they do not match in resolution. This is for the best anyway, as the images are too low resolution to be attractive spanned across multi mon.
Whoops keyboard error
Added a tiny bit of readme
Merge pull request #1 from dermoerder/master

Scaling & Improved Readme