Updating babel to latest version#5097

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skevy wants to merge 3 commits intofacebook:masterfrom

skevy:update-babel

Commits on Jan 3, 2016

updating babel to latest
skevy
committed

Commits on Jan 6, 2016

lock babel to the minor version (e.g. 6.3.x)
skevy
committed

Commits on Jan 7, 2016

updating any available babel deps to 6.4.x
skevy
committed