Support React 0.14 and Components as Functions

[joshblack]

Was looking through the workshop resources and was curious about the possibility of introducing components as just functions. May be a useful path into introducing the idea of composition and showing how much you are able to accomplish with this model without having to use classes for managing state.

[mjackson]

Thanks for the feedback, @joshblack. We upgraded this repo to React 0.14 and are now using plain functions for the first couple of examples we do. It's a great way to simplify getting into React for the first time.