update react version to 0.12.0
update react version to 0.12.0

r3dm/tailspin,SlideNow/react-code-mirror,AyseAkr/react-code-mirror,r3dm/tailspin,ForbesLindesay/react-code-mirror,chenyunchen/react-code-mirror,SlideNow/react-code-mirror,AyseAkr/react-code-mirror,chenyunchen/react-code-mirror,ForbesLindesay/react-code-mirror