Merge branch 'master' into cq_limited_pollers

BUILD

CMakeLists.txt

INSTALL.md

Makefile

PYTHON-MANIFEST.in

binding.gyp

build.yaml

config.m4

gRPC-Core.podspec

grpc.def

grpc.gemspec

include/grpc/grpc_security.h

include/grpc/impl/codegen/compression_types.h

include/grpc/impl/codegen/gpr_types.h

include/grpc/impl/codegen/grpc_types.h

include/grpc/impl/codegen/port_platform.h

include/grpc/impl/codegen/slice.h

include/grpc/slice.h

include/grpc/slice_buffer.h

package.xml