Merge branch 'master' into epoll_thread_pool

Makefile

Rakefile

binding.gyp

build.yaml

include/grpc/impl/codegen/grpc_types.h

include/grpc/impl/codegen/port_platform.h

package.json

setup.py

src/compiler/cpp_generator.cc

src/core/ext/filters/client_channel/client_channel.c

src/core/ext/filters/client_channel/lb_policy.h

...core/ext/filters/client_channel/lb_policy/grpclb/grpclb.c

src/core/ext/transport/cronet/transport/cronet_transport.c

src/core/lib/iomgr/port.h

src/core/lib/support/cpu_linux.c

src/core/lib/support/wrap_memcpy.c

src/node/ext/call.cc

src/node/ext/channel.cc

src/node/ext/completion_queue.cc

src/node/ext/completion_queue_async_worker.h