Merge branch 'master' of github.com:grpc/grpc into lr_hook

BUILD

Makefile

README.md

binding.gyp

build.yaml

config.m4

doc/connectivity-semantics-and-api.md

examples/cpp/helloworld/Makefile

gRPC.podspec

grpc.def

grpc.gemspec

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

include/grpc++/server_builder.h

include/grpc/grpc.h

package.xml

src/core/ext/census/gen/README.md

src/core/ext/census/gen/census.pb.c

src/core/ext/census/gen/census.pb.h

src/core/ext/client_config/subchannel.c

src/core/ext/client_config/subchannel_index.c