Matching code to tutorial

I had a PR in to the emberjs/website repo to match the tutorial to the code, but @rwjblue told me that the tutorials are more recent. Here, I fixed all the differences I saw, and tried to keep all of the commit messages similar. It seems like once these are in I can go into the emberjs/website repo and link to these code diffs instead of the older ones, and update the JSbins if needed. Let me know if there is anything else I can do, or if there is any refining that needs to be done. Thanks!