Netstandard upgrade

[dazinator]

The latest beta's of Lucene.Net target netstandard.

If we could upgrade this Lucene.Net.Linq and Nuget.Lucene to target that then you could run lightening fast nuget feed on multiple platforms including linux :-)

I had a quick look at all the dependencies, and it would involve taking a few betas at this stage, however it looks like there are some breaking changes in Lucene.Net version 4 and I am not familiar enough with Lucene in order to fix them.

[chriseldredge]

There is an old branch in v4_0 https://github.com/themotleyfool/Lucene.Net.Linq/tree/v4_0 which has some changes for Remotion.Linq.

The major dependencies are on Remotion and Lucene.Net. If both of those have ports to netstandard, this project will be ready to make the migration.

Personally I will not have the time to focus on this effort, but I'm happy to assist and help transfer some ownership if a community forms around this project or Klondike / NuGet.Lucene in general.