Merge github.com:grpc/grpc into bm_stream

BUILD

CMakeLists.txt

Makefile

build.yaml

build_config.rb

doc/command_line_tool.md

doc/environment_variables.md

doc/g_stands_for.md

package.json

package.xml

src/core/ext/transport/cronet/transport/cronet_api_dummy.c

src/core/ext/transport/cronet/transport/cronet_transport.c

src/core/lib/surface/call.c

src/core/lib/surface/call.h

src/core/lib/surface/init.c

src/core/lib/surface/version.c

src/cpp/common/version_cc.cc

src/csharp/Grpc.Auth/project.json

src/csharp/Grpc.Core/VersionInfo.cs

src/csharp/Grpc.Core/project.json