net451 support and netcoreapp1.0->netstandard1.5 for libraries

[rmja]

Resolves #89

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[dnfclas]

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[SteveSandersonMS]

Thanks very much! This is now merged.

If you discover anything not working on .NET 4.5.1, please let me know. My testing has been all about .NET Core.

[aminebizid]

Thank you
Nuget ready?

[laskoviymishka]

What about netsyandart 1.6? It's escalate quickly :)

[xabikos]

Actually instead of targeting netstandard1.6 we should try and target a lowest number if possible (1.3) as this would give much more compatibility especially now that full .net framework is supported. Of course I don't know if it's possible based on api's the library uses.

[laskoviymishka]

Well it could, we need investigate possibilities of such targeting's