Lesson #3: Objects

I decided to shuffle up the lessons a bit based on where the kids were heading. Tomorrow I'm going to go over adding objects and some basic interactivity to the maps. I'd still like to polish this a bit, but I think it's a good enough base. I'm a little nervous about how many kids are going to show up, but this should be an easier lesson than the character one. A lot less typing in code, a lot more experimenting.

Heads up to mentors, I think during free time we might have to help some of the kids with their character logic. Most of them got it going, but some kids have some crazy maps that mean you have to tweak the character's logic to fit in right.

/cc @CoderDojoSF/mentors