Merge github.com:grpc/grpc into naming-crisis

BUILD

build.yaml

gRPC.podspec

grpc.gemspec

include/grpc++/server.h

package.json

src/core/iomgr/iocp_windows.c

src/core/iomgr/iomgr.c

src/core/iomgr/pollset_posix.c

src/core/iomgr/pollset_windows.c

src/core/iomgr/timer.c

src/core/iomgr/timer.h

src/core/iomgr/timer_internal.h

src/core/surface/completion_queue.c

src/core/transport/chttp2/internal.h

src/core/transport/chttp2/stream_lists.c

src/core/transport/chttp2/writing.c

src/core/transport/chttp2_transport.c

src/cpp/server/server.cc

src/cpp/server/server_builder.cc