Merge github.com:grpc/grpc into things_be_slow

Makefile

binding.gyp

build.yaml

include/grpc++/client_context.h

include/grpc++/server.h

package.json

src/core/census/initialize.c

src/core/client_config/lb_policies/pick_first.c

src/core/client_config/subchannel.c

src/core/surface/init.c

src/core/surface/version.c

src/cpp/client/client_context.cc

src/cpp/server/server.cc

src/cpp/util/byte_buffer.cc

src/csharp/Grpc.Core/VersionInfo.cs

src/node/ext/byte_buffer.cc

src/node/index.js

src/node/src/client.js

src/node/src/credentials.js

src/node/src/grpc_extension.js