Make static builds deterministic by constant reactid's

[syrusakbary]

Make static builds deterministic by constant reactid's. Fixed #22

[KyleAMathews]

Thanks! Already enjoying the nice clean diffs on builds + it's fun to see the "gatsby"s littered through the generated html :-)

[KyleAMathews]

@syrusakbary so... this isn't working after converting code to Babel as when compiled, the createReactRootIndex override gets moved below the various imports meaning the root index is already set by the time we override the function.

I'm pretty new to Babel—any suggestions on how to fix this so our override gets set in time?

EDIT:
stackoverflow: imports are hoisted

[jlengstorf]

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