Merge github.com:grpc/grpc into accounting

src/core/lib/client_config/resolvers/sockaddr_resolver.c

src/core/lib/iomgr/pollset_set_windows.c

src/ruby/ext/grpc/rb_byte_buffer.c

src/ruby/ext/grpc/rb_call.c

test/distrib/node/run_distrib_test.sh

tools/run_tests/build_artifact_node.sh

tools/run_tests/build_artifact_python.sh

tools/run_tests/build_node.sh

tools/run_tests/build_package_node.sh

tools/run_tests/pre_build_node.sh

tools/run_tests/run_node.sh

tools/run_tests/run_tests.py

vsprojects/build_vs2010.bat

vsprojects/build_vs2013.bat

vsprojects/build_vs2015.bat