Merge remote-tracking branch 'upstream/master' into cares_buildin

.gitignore

BUILD

CMakeLists.txt

Makefile

PYTHON-MANIFEST.in

README.md

build.yaml

examples/cpp/cpptutorial.md

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

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

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

examples/csharp/helloworld-from-cli/GreeterClient/Program.cs

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

examples/csharp/helloworld-from-cli/GreeterServer/Program.cs

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

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

examples/csharp/helloworld/README.md

examples/node/package.json

examples/objective-c/auth_sample/AuthTestService.podspec

examples/objective-c/helloworld/HelloWorld.podspec