Fixes #14. Children, if present, are required to be of type string, node, or element.#22

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Commits on Apr 30, 2016

Fixes #14. Children aren't required, but if they are present they must be of type string, node, or element. This should allow nesting of custom elements (icons) inside buttons.
Andrewpk
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Fixed spacing mistake.
Andrewpk
committed