Updating React to 0.12.2.
Updating React to 0.12.2.

Fixes #1

HorizonXP/python-react-router,markfinger/python-react,markfinger/python-react,acrispin/python-react,fanscribed/django-react,fanscribed/django-react,HorizonXP/python-react-router,mic159/react-render,abdelouahabb/python-react,HorizonXP/python-react-router,mic159/react-render,acrispin/python-react,mic159/react-render,arceduardvincent/python-react,arceduardvincent/python-react,abdelouahabb/python-react