Update for React core/renderer changes

[iamdustan]

React has updated how it bundles and shares code. React Isomorphic is now the core and all internals are hidden.

Relevant React PRs:
facebook/react#7164
facebook/react#7168

[gaearon]

(It’s not in any of stable releases yet though. We didn’t cherry-pick this to 15.x yet.)

[iamdustan]

just reminding myself. 😄

Looks like I can still install the nightly: http://react.zpao.com/builds/master/latest/

[gaearon]

👍

[oatkiller]

👍

[evilbs]

👍