Adds helpful files for printing the case at maker spaces

Hello! Thank you for this awesome project! I am very excited to build this, but ran into a small hiccup today at the local maker space, this being my first time doing laser cutting. Their printer is hooked up to print from Corel Draw, and I thought, "piece of cake, I can just use the `ready-for-ponoko.svg` file and crank it out on this 12x24 laser cutter!" I was slightly off, though, because I realized that it needed to be at 300dpi resolution, and without all the stuff around the borders, so I spent some time trying to clean it up, but ran out of time to actually make the print (they timeblock usage there) :frowning:  I hope to use these files some time in the next week to cut out a case, and hopefully these files can help out others who run into similar glitches.