Volume 1

My progress on Volume 1 so far.  

There are still some more exercises on my scaffold for volume 1 to add, but they are perhaps not so essential.  Could either finish them off tonight, or put them on the back burner to work on something more pressing.

I will probably clean up how sketches work a little more, because I was really just fumbling through the code trying to figure out how it works.  Now that I do know how it works, I could accomplish the same things more cleanly, and add some extra functionality (like labels on line segments, or changing the color of the line segments).