Merge github.com:grpc/grpc into bye-bye-completion-queue-pie

Makefile

build.json

include/grpc++/async_generic_service.h

include/grpc++/completion_queue.h

include/grpc++/impl/service_type.h

include/grpc++/server.h

include/grpc++/server_builder.h

include/grpc/grpc.h

src/compiler/cpp_generator.cc

src/core/surface/server.c

src/core/surface/server.h

src/core/surface/server_create.c

src/cpp/server/async_generic_service.cc

src/cpp/server/server.cc

src/cpp/server/server_builder.cc

src/csharp/ext/grpc_csharp_ext.c

src/node/examples/math.proto

src/node/examples/route_guide.proto

src/node/examples/stock.proto

src/node/ext/server.cc