Update for 2017#2

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silentsilas wants to merge 6 commits intojawj:masterfrom

level2d:update-2017

Commits on Sep 21, 2017

add python instructions for Sierra, fix renamed import

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update threejs

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take out gzipping temporarily

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fix outdated threejs code

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uncomment compression. add closure compiler as npm dependency. add some logging.

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see previous commit. and take node_modules out of repo.

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