adding houdini properties to inheritance data#303

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chrisdavidmills merged 3 commits intomdn:masterfrom chrisdavidmills:houdini-inheritance-data

Jan 9, 2019

+133

Commits on Sep 28, 2018

Commits on Oct 1, 2018

correcting CSSUnitValue inheritance as per jpmedley comment
chrisdavidmills
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