Add install to makefile.
Add install to makefile.

Test plan:
* rm -rf node_modules
* make
* check bundle.js to see it looks reasonable

Auditors: justinjaffray

redsunsoft/react-components,jepezi/react-components,vasanthk/react-components,quicktoolbox/react-components,Khan/react-components,quicktoolbox/react-components,jepezi/react-components,sloria/react-components,sloria/react-components,Khan/react-components,redsunsoft/react-components,redsunsoft/react-components,sloria/react-components,vasanthk/react-components,quicktoolbox/react-components,jepezi/react-components,vasanthk/react-components,Khan/react-components