Some modern features in Icon and IconStack#52

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a-malykhin wants to merge 3 commits intoandreypopp:masterfrom

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Commits on Feb 24, 2017

Implement Icon and IconStack as stateless presentation component. Add classnames package for more shorten manage of React component className. Add defaultProps for all non-required properties.
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add new lines at the end of files
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Commits on Feb 27, 2017

add classnames import
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