Merge github.com:grpc/grpc into cpparena

.gitignore

CMakeLists.txt

Makefile

PYTHON-MANIFEST.in

build.yaml

doc/server_side_auth.md

examples/cpp/README.md

examples/cpp/cpptutorial.md

examples/csharp/route_guide/README.md

examples/node/dynamic_codegen/route_guide/README.md

examples/node/static_codegen/route_guide/README.md

examples/objective-c/auth_sample/README.md

examples/objective-c/helloworld/README.md

examples/objective-c/route_guide/README.md

examples/php/route_guide/README.md

examples/ruby/errors_and_cancellation/README.md

examples/ruby/route_guide/README.md

grpc.def

include/grpc++/server.h

include/grpc/grpc.h