Merge github.com:grpc/grpc into trim-the-locks

.gitignore

.pylintrc

CMakeLists.txt

Makefile

bazel/cc_grpc_library.bzl

bazel/generate_cc.bzl

bazel/grpc_build_system.bzl

binding.gyp

build.yaml

composer.json

doc/PROTOCOL-WEB.md

doc/server_side_auth.md

doc/status_ordering.md

examples/csharp/helloworld-from-cli/global.json

examples/php/composer.json

gRPC-Core.podspec

gRPC-ProtoRPC.podspec

gRPC-RxLibrary.podspec

gRPC.podspec

grpc.def