Merge branch 'master' into alarm_mods

BUILD

Makefile

binding.gyp

build.yaml

gRPC.podspec

grpc.gemspec

package.json

src/boringssl/gen_build_yaml.py

src/compiler/cpp_generator.cc

src/core/iomgr/pollset_windows.c

src/node/ext/byte_buffer.cc

src/php/ext/grpc/config.m4

src/python/grpcio/grpc_core_dependencies.py

templates/BUILD.template

templates/Makefile.template

templates/gRPC.podspec.template

templates/tools/dockerfile/test/sanity/Dockerfile.template

templates/tools/doxygen/Doxyfile.core.internal.template

templates/tools/doxygen/Doxyfile.core.template

templates/vsprojects/cpptest.props.template