Merge branch 'master' of github.com:google/grpc into docker

Makefile

build.json

include/grpc/grpc.h

src/core/channel/channel_stack.c

src/core/channel/connected_channel.c

src/core/iomgr/pollset_posix.c

src/core/iomgr/resolve_address.c

src/core/iomgr/socket_utils_linux.c

src/core/iomgr/socket_utils_posix.c

src/core/iomgr/tcp_server_posix.c

src/core/support/log_linux.c

src/core/support/log_posix.c

src/core/support/string_posix.c

src/core/surface/byte_buffer_queue.c

src/core/surface/byte_buffer_queue.h

src/core/surface/call.c

src/core/surface/call.h

src/core/surface/channel.c

src/core/surface/client.c

src/core/surface/completion_queue.c