TEALS SNAP 2.1 example code

[jdonwells]

In the 2.1 lecture, we talk a bit about good coding habits. The example (https://snap.berkeley.edu/snap/snap.html#present:Username=brettwo&ProjectName=Lesson%202.1%20Example) shows 4 samples of code.

It seems like those 4 samples should do the same things. A direct apples to apples comparison instead of oranges.

One thing I added to Unit 1 was a direct comparison of 4 different ways to code the knock knock joke. I added it to start talking about design, but it also illustrates different ways to code the same thing. One of which has advantages over the other 3.