.NET Standard support#6

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matthidinger wants to merge 3 commits intomasterfrom

Commits on May 27, 2016

corex fx compiling but not working yet
matthidinger
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Commits on May 31, 2016

project compiling with .net 3.5, .net 4; and netstandard 1.5; added empy tests project, planning to run tests across the platforms
matthidinger
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Commits on Nov 21, 2017

updated to netstandard 2.0 and it's semi-working.
matthidinger
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