Merge github.com:grpc/grpc into cleaner-build

BUILD

Makefile

build.yaml

examples/README.md

examples/cpp/helloworld/greeter_async_client.cc

examples/cpp/helloworld/greeter_async_server.cc

examples/cpp/helloworld/greeter_client.cc

examples/cpp/helloworld/greeter_server.cc

examples/cpp/route_guide/helper.cc

examples/cpp/route_guide/helper.h

examples/cpp/route_guide/route_guide_client.cc

examples/cpp/route_guide/route_guide_server.cc

examples/csharp/README.md

examples/csharp/route_guide/README.md

examples/node/route_guide/README.md

examples/objective-c/auth_sample/README.md

examples/objective-c/helloworld/README.md

examples/objective-c/route_guide/README.md

examples/php/route_guide/README.md

examples/php/route_guide/route_guide.php