Add few methods to web API

[cwayfinder]

[manolo]

Review status: 0 of 3 files reviewed at latest revision, 1 unresolved discussion, all commit checks successful.

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^{lib/com/vaadin/polymer/elemental/NodeList.java, line 7 [r1] (raw file):} I would not use generics for this interface, which could make it more restrictive. I would let the generic T extends Node in the item method

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Comments from the review on Reviewable.io

[cwayfinder]

Review status: 0 of 3 files reviewed at latest revision, 1 unresolved discussion, all commit checks successful.

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^{lib/com/vaadin/polymer/elemental/NodeList.java, line 7 [r1] (raw file):} Done.

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Comments from the review on Reviewable.io

[manolo]

Reviewed 1 of 2 files at r2. Review status: 1 of 3 files reviewed at latest revision, 1 unresolved discussion, all commit checks successful.

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^{lib/com/vaadin/polymer/elemental/NodeList.java, line 7 [r1] (raw file):} You can remove as well.

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Comments from the review on Reviewable.io

[manolo]

Reviewed 1 of 3 files at r1, 1 of 1 files at r3. Review status: all files reviewed at latest revision, 1 unresolved discussion, all commit checks successful.

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Comments from the review on Reviewable.io