Adding notes to controller

Awesome, awesome application Lei!

I think that the overall design is great, and I really like that you were incorporate collections into your app. The API is fantastic, and you did a kickass job on bootstrap integration.

I added a few small remarks to the application that you can see in this pull request, but overall - fantastic job, I'm really impressed.

I really hope that you continue to use Ruby and Rails and I really hope to see you around General Assembly in the future.

All the best,
Brooks