Ensure Polymer 3 Modulizer compatibility

[web-padawan]

Fixes #6

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This change is 

[yuriy-fix]

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Reviewed 2 of 2 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[platosha]

Reviewed 6 of 6 files at r2.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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test/basic.html, line 50 at r2 (raw file):

        fixture('default');
        // wait for usage statistics to load
        setTimeout(done, 100);

BTW this is not clean, magic timeout value. Not a blocker, can fix later.

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Comments from Reviewable

[platosha]

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Review status: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from Reviewable

[tomivirkki]

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Reviewed 1 of 2 files at r1, 6 of 6 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from Reviewable