Updates for Xcode 9 and Swift 4#7

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thedavidharris wants to merge 3 commits intoQuick:masterfrom

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Commits on Oct 10, 2017

Updates for Xcode 9 and Swift 4
Harris, David (D.A.)
committed
Update playgrounds after Swift 4 and Xcode 9 changes
Harris, David (D.A.)
committed
Update Travis to use Xcode 9
Harris, David (D.A.)
committed