Fixes in pom: use generated pom for deployment. Configure pom in pakage.json. Fix demo

[manolo]

[Saulis]

Looks good, I'll test it out manually after vaadin/gwt-api-generator#33 has been merged.

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Review status: 0 of 4 files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from the review on Reviewable.io

[Saulis]

Review status: 0 of 4 files reviewed at latest revision, 3 unresolved discussions, all commit checks successful.

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^{package.json, line 4 [r2] (raw file):} I would remove release property.

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^{package.json, line 9 [r2] (raw file):} Remove #mcm_pom before merging.

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^{package.json, line 14 [r2] (raw file):} I would use organization here instead of org to reflect the usage.

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Comments from the review on Reviewable.io

[Saulis]

Reviewed 1 of 4 files at r1, 4 of 4 files at r4. Review status: :shipit: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from the review on Reviewable.io