Merge branch 'master' of https://github.com/grpc/grpc into frame-size

INSTALL.md

composer.json

doc/unit_testing.md

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

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

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

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

setup.py

src/boringssl/gen_build_yaml.py

src/core/ext/transport/chttp2/transport/chttp2_transport.c

src/core/ext/transport/chttp2/transport/parsing.c

src/cpp/common/core_codegen.cc

src/node/index.js

src/node/src/client.js

src/node/src/common.js

src/node/src/metadata.js

src/php/composer.json

src/python/grpcio/commands.py

src/python/grpcio/grpc/__init__.py

src/python/grpcio_health_checking/setup.py