Merge github.com:grpc/grpc into hybrid

BUILD

CMakeLists.txt

Makefile

README.md

WORKSPACE

bazel/BUILD

bazel/cc_grpc_library.bzl

bazel/generate_cc.bzl

bazel/grpc_build_system.bzl

build.yaml

doc/interop-test-descriptions.md

src/compiler/objective_c_plugin.cc

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

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

...t/filters/http/message_compress/message_compress_filter.c

src/core/ext/filters/message_size/message_size_filter.c

src/core/ext/transport/chttp2/server/chttp2_server.c

src/core/lib/slice/slice_hash_table.c

src/core/lib/slice/slice_hash_table.h

src/core/lib/support/stack_lockfree.c