Use the react-tools module to require React

I ran into difficulties getting this working because I was running into the error "Cannot find module 'React'" even though I had react-tools installed globally. I did some digging and eventually found require('react-tools').React works, but apparently require('react-tools/build/modules/React') is preferable for reasons related to browserify. 

(My apologies if the branching/protocol for this pull request isn't correct, it's my first time)