Create gifs or screenshots of tutorial code

[KevinWorkman]

It would be neat to have screenshots (preferably gifs) accompanying any example code in the tutorials.

I've already done this for the new Hour of Code tutorials: http://staticvoidgames.com/tutorials/hourOfCode/index

I used ScreenToGif to generate those: https://screentogif.codeplex.com/

There are some issues with that, but it seemed to work okay.