Merge branch 'master' into handshaker

BUILD

CMakeLists.txt

Makefile

WORKSPACE

bazel/grpc_build_system.bzl

binding.gyp

build.yaml

composer.json

config.m4

doc/PROTOCOL-WEB.md

doc/compression.md

doc/cpp-style-guide.md

doc/fail_fast.md

doc/service_config.md

doc/stress_test_framework.md

doc/unit_testing.md

doc/workarounds.md

examples/BUILD

examples/php/composer.json

gRPC-Core.podspec