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

BUILD

Makefile

binding.gyp

build.yaml

config.m4

examples/node/static_codegen/helloworld_grpc_pb.js

examples/node/static_codegen/helloworld_pb.js

...es/node/static_codegen/route_guide/route_guide_grpc_pb.js

examples/node/static_codegen/route_guide/route_guide_pb.js

examples/ruby/lib/helloworld_services.rb

examples/ruby/lib/route_guide_services.rb

gRPC.podspec

grpc.def

grpc.gemspec

include/grpc/impl/codegen/atm.h

include/grpc/impl/codegen/atm_windows.h

include/grpc/impl/codegen/connectivity_state.h

include/grpc/impl/codegen/grpc_types.h

include/grpc/impl/codegen/port_platform.h

include/grpc/impl/codegen/sync.h