Merge pull request #656 from jtattermusch/csharp_projectrename

src/csharp/EXPERIMENTAL-ONLY

src/csharp/Grpc.Core.Tests/.gitignore

src/csharp/Grpc.Core.Tests/ClientServerTest.cs

src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj

src/csharp/Grpc.Core.Tests/GrpcEnvironmentTest.cs

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

src/csharp/Grpc.Core.Tests/ServerTest.cs

src/csharp/Grpc.Core.Tests/TestResult.xml

src/csharp/Grpc.Core.Tests/TimespecTest.cs

src/csharp/Grpc.Core.Tests/packages.config

src/csharp/Grpc.Core/.gitignore

src/csharp/Grpc.Core/Call.cs

src/csharp/Grpc.Core/Calls.cs

src/csharp/Grpc.Core/Channel.cs

src/csharp/Grpc.Core/ClientStreamingAsyncResult.cs

src/csharp/Grpc.Core/Grpc.Core.csproj

src/csharp/Grpc.Core/GrpcEnvironment.cs

src/csharp/Grpc.Core/Internal/AsyncCall.cs

...harp/Grpc.Core/Internal/BatchContextSafeHandleNotOwned.cs

src/csharp/Grpc.Core/Internal/CallSafeHandle.cs