Merge github.com:grpc/grpc into grand-unified-closures

BUILD

CMakeLists.txt

Makefile

Rakefile

build.yaml

examples/csharp/helloworld/Greeter/Greeter.csproj

...ples/csharp/helloworld/GreeterClient/GreeterClient.csproj

...ples/csharp/helloworld/GreeterServer/GreeterServer.csproj

examples/csharp/route_guide/RouteGuide/RouteGuide.csproj

...harp/route_guide/RouteGuideClient/RouteGuideClient.csproj

...harp/route_guide/RouteGuideServer/RouteGuideServer.csproj

include/grpc++/impl/codegen/client_context.h

include/grpc/impl/codegen/grpc_types.h

setup.py

src/core/ext/transport/chttp2/transport/chttp2_transport.c

src/core/ext/transport/chttp2/transport/frame.h

src/core/ext/transport/chttp2/transport/hpack_encoder.c

src/core/ext/transport/chttp2/transport/hpack_encoder.h

src/core/ext/transport/chttp2/transport/internal.h

src/core/ext/transport/chttp2/transport/writing.c