Sign assemblies with strong name key file

[JosephFerano]

This PR addresses #990 and #1235

[JosephFerano]

I attempted to use public signing, but ran into a similar issue to this:

dotnet/machinelearning#600 (comment)

If you would prefer having the snk file somewhere else, let me know and I'll gladly move it to it's appropriate location.

[dsyme]

See comment here, #1235 (comment)

[JosephFerano]

Thank you for merging. The reason for the strong naming is that our .netstandard project was recently integrated into one of our products. It's a plugin for an older system that only supports .Net framework and assemblies have to be signed.