Merge github.com:grpc/grpc into monkey_man

CONTRIBUTING.md

INSTALL

INSTALL.md

README.md

examples/cpp/README.md

examples/cpp/cpptutorial.md

examples/cpp/helloworld/README.md

src/python/grpcio/tests/_runner.py

src/python/grpcio/tests/tests.json

src/python/grpcio/tests/unit/_sanity/__init__.py

src/python/grpcio/tests/unit/_sanity/_sanity_test.py

tools/run_tests/build_python.sh

tools/run_tests/run_interop_tests.py

tools/run_tests/run_python.sh

tools/run_tests/run_tests.py