Convert to an ES6 module?

[Rowan Winsemius]

Hi @mourner

Just wondering if you're open to converting this to an ES6 module as per the approach you've taken with quickselect.

If you are happy I'm willing to put together the pull request.

Thanks,
Rowan

[Lars Knudsen]

That would be awesome - especially if it fixes the ES6 issue here: Polymer/tools#608 mentioning openlayers/openlayers#7766