Merge github.com:grpc/grpc into pid_ctl

BUILD

CMakeLists.txt

Makefile

binding.gyp

build.yaml

config.m4

doc/images/stress_test_framework.png

doc/interop-test-descriptions.md

doc/stress_test_framework.md

...es/node/dynamic_codegen/route_guide/route_guide_client.js

...les/node/static_codegen/route_guide/route_guide_client.js

gRPC-Core.podspec

grpc.def

grpc.gemspec

include/grpc++/ext/reflection.grpc.pb.h

include/grpc++/impl/codegen/method_handler_impl.h

include/grpc++/impl/codegen/server_context.h

include/grpc++/impl/codegen/service_type.h

include/grpc++/impl/codegen/sync_stream.h

include/grpc++/resource_quota.h