Add logo.js to example files

I thought it would be fitting to include a giant JS logo as an example. It's 100x100x1 and there's also a 'cube' function that produces a four-sided cube.

Here's a screenshot of it in-game:

![giant JS logo by rupl](http://fourkitchens.com/sites/default/files/blog/lead-images/scriptscraft-js_0.jpg)