Merge remote-tracking branch 'upstream/v1.4.x' into upmerge_1.4.x

BUILD

binding.gyp

config.w32

package.json

src/csharp/Grpc.Core.Tests/ServerTest.cs

src/csharp/Grpc.Core/Server.cs

src/csharp/ext/grpc_csharp_ext.c

src/node/src/grpc_extension.js

src/node/test/surface_test.js

src/php/ext/grpc/version.h

templates/binding.gyp.template

templates/config.w32.template

templates/package.json.template

templates/src/php/ext/grpc/version.h.template

test/distrib/node/run_distrib_test.sh

tools/run_tests/artifacts/build_artifact_node.bat

tools/run_tests/artifacts/build_artifact_node.sh

tools/run_tests/helper_scripts/pre_build_node.bat

tools/run_tests/helper_scripts/pre_build_node.sh

tools/run_tests/run_tests.py