Upgraded to .NET Core 2.0 / .NET Standard 2.0#64

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andrewdouglas wants to merge 1 commit intomperdeck:masterfrom andrewdouglas:master

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Commits on Sep 24, 2018

Upgraded to .NET Core 2.0 / .NET Standard 2.0. Swapped out MSTest with xUnit (all tests passing). Updated relative paths in TestConsoleApplication assembly to work with "dotnet run" command.
andrewdouglas
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