Translated to es6#3

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SKalt wants to merge 5 commits intolukehorvat:masterfrom

Commits on May 30, 2018

Moved to an es6+ webpack architecture
Steven Kalt
committed
Exposed internals for testing. All unit tests pass.
Steven Kalt
committed
Added package-lock.
Steven Kalt
committed
Added a "module" field for bundlers, and transpiled "main".
Steven Kalt
committed
use `const` instead of `var`, remove explicit babel-polyfill import
Steven Kalt
committed