Module support fix

[shshaw]

Allows for import "FLIP" in Webpack and other module systems.

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[shshaw]

I signed it!

[googlebot]

CLAs look good, thanks!

[googlebot]

CLAs look good, thanks!

[addyosmani]

LGTM. Will need @paullewis to sign off.

[JSteunou]

@paullewis by any chance?