Merge github.com:grpc/grpc into c3+r+l

.gitignore

.pylintrc

BUILD

CMakeLists.txt

Makefile

WORKSPACE

build.yaml

doc/service_config.md

gRPC-Core.podspec

grpc.def

grpc.gemspec

...e/grpc++/ext/health_check_service_server_builder_option.h

include/grpc++/health_check_service_interface.h

include/grpc++/impl/codegen/call.h

include/grpc++/impl/codegen/server_context.h

include/grpc++/impl/codegen/sync_stream.h

include/grpc++/server.h

include/grpc++/test/server_context_test_spouse.h

include/grpc/grpc.h

include/grpc/impl/codegen/atm_gcc_atomic.h