Merge github.com:grpc/grpc into uberpoll

INSTALL.md

composer.json

setup.py

src/php/composer.json

src/python/grpcio_health_checking/setup.py

src/python/grpcio_reflection/setup.py

src/python/grpcio_tests/setup.py

templates/composer.json.template

templates/src/php/composer.json.template

templates/tools/dockerfile/gcp_api_libraries.include

...ols/dockerfile/test/csharp_jessie_x64/Dockerfile.template

.../tools/dockerfile/test/cxx_jessie_x64/Dockerfile.template

.../tools/dockerfile/test/cxx_jessie_x86/Dockerfile.template

...ls/dockerfile/test/cxx_ubuntu1404_x64/Dockerfile.template

...ls/dockerfile/test/cxx_ubuntu1604_x64/Dockerfile.template

.../tools/dockerfile/test/cxx_wheezy_x64/Dockerfile.template

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

.../dockerfile/test/multilang_jessie_x64/Dockerfile.template

...tools/dockerfile/test/node_jessie_x64/Dockerfile.template

...tools/dockerfile/test/php7_jessie_x64/Dockerfile.template