Upgrade fbjs to 0.8.0-alpha.3
Upgrade fbjs to 0.8.0-alpha.3

Summary: Closes https://github.com/facebook/relay/pull/908

Differential Revision: D3012737

Pulled By: steveluscher

fb-gh-sync-id: 5e5d8d027601d669fd6d47199197deb71eaf176a
shipit-source-id: 5e5d8d027601d669fd6d47199197deb71eaf176a

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