Merge github.com:grpc/grpc into framing_costs

examples/csharp/helloworld-from-cli/Greeter.sln

examples/csharp/helloworld-from-cli/Greeter/Greeter.csproj

examples/csharp/helloworld-from-cli/Greeter/Helloworld.cs

...ples/csharp/helloworld-from-cli/Greeter/HelloworldGrpc.cs

examples/csharp/helloworld-from-cli/Greeter/project.json

...rp/helloworld-from-cli/GreeterClient/GreeterClient.csproj

...les/csharp/helloworld-from-cli/GreeterClient/project.json

...rp/helloworld-from-cli/GreeterServer/GreeterServer.csproj

...les/csharp/helloworld-from-cli/GreeterServer/project.json

examples/csharp/helloworld-from-cli/README.md

examples/csharp/helloworld-from-cli/generate_protos.bat

examples/csharp/helloworld-from-cli/global.json

examples/csharp/helloworld/Greeter/Greeter.csproj

examples/csharp/helloworld/Greeter/Helloworld.cs

examples/csharp/helloworld/Greeter/HelloworldGrpc.cs

examples/csharp/helloworld/Greeter/packages.config

...ples/csharp/helloworld/GreeterClient/GreeterClient.csproj

examples/csharp/helloworld/GreeterClient/packages.config

...ples/csharp/helloworld/GreeterServer/GreeterServer.csproj

examples/csharp/helloworld/GreeterServer/packages.config