The introduction about pycar14

[tommeagher]

After Chris added his extra steps, I just moved that IPython notebook to the takehome/ dir. People can play with it on their own. His new steps addressed a lot of the concepts in a more organic way.

If this slide deck is OK with everyone, I'll go ahead and close this issue too, and we can move on to lessons 2-4 and the take home materials.

[kevinschaul]

Looks great, Tom.

As for the intro notebook, I agree that it may be a bit much for the first half-hour, but it's all so fundamentally important. Some things that I think could wait for later sessions (if we do want to trim):

• immutability of strings
• dir()
• string + number and other type casting stuff