Merge pull request #1610 from jtattermusch/nuget_packages

src/csharp/.gitignore

src/csharp/EXPERIMENTAL-ONLY

src/csharp/Grpc.Auth/Grpc.Auth.nuspec

src/csharp/Grpc.Auth/Properties/AssemblyInfo.cs

src/csharp/Grpc.Core.Tests/Properties/AssemblyInfo.cs

src/csharp/Grpc.Core/.gitignore

src/csharp/Grpc.Core/Grpc.Core.nuspec

src/csharp/Grpc.Core/Properties/AssemblyInfo.cs

...sharp/Grpc.Examples.MathClient/Properties/AssemblyInfo.cs

...sharp/Grpc.Examples.MathServer/Properties/AssemblyInfo.cs

src/csharp/Grpc.Examples.Tests/Properties/AssemblyInfo.cs

src/csharp/Grpc.Examples/Properties/AssemblyInfo.cs

...Grpc.IntegrationTesting.Client/Properties/AssemblyInfo.cs

...Grpc.IntegrationTesting.Server/Properties/AssemblyInfo.cs

...csharp/Grpc.IntegrationTesting/Properties/AssemblyInfo.cs

src/csharp/Grpc.nuspec

src/csharp/build_packages.bat

src/csharp/buildall.bat

vsprojects/nuget_package/README.md

vsprojects/nuget_package/grpc.native.csharp_ext.nuspec