google-map Polymer 3.0

Updating to support the Polymer 3.0 preview. Took a few extra changes after modulizer to make it work. I guess it won't get merged, but hopefully other people who want to run the component on 3.0 will see this PR. :)

It's also published to npm under @em-polymer/google-map, so it should be fairly easy to install and use the fork for now, and then migrate once this repo comes alive. :)

Feb 13 '18 21:02 emedvedev

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