Fix focuszone props#4335

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dzearing merged 5 commits intomicrosoft:masterfrom

joschect:fix-focuszone-props

Mar 27, 2018

Commits on Mar 15, 2018

Revert "FocusTrapZone does not correctly trap focus when last child is FocusZone (#4172)"
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Commits on Mar 20, 2018

Merge branch 'master' of https://github.com/OfficeDev/office-ui-fabric-react
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Commits on Mar 21, 2018

Merge branch 'master' of https://github.com/OfficeDev/office-ui-fabric-react
joschect
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Fix focus zone props so that it doesn't have a typescript error
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Commits on Mar 22, 2018

adding change file
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