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

BUILD

Makefile

PYTHON-MANIFEST.in

binding.gyp

build.yaml

examples/protos/helloworld.proto

examples/protos/route_guide.proto

gRPC.podspec

grpc.gemspec

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

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

package.json

requirements.txt

setup.py

src/boringssl/gen_build_yaml.py

src/compiler/cpp_generator.cc

src/core/iomgr/pollset_windows.c

src/core/transport/static_metadata.c

src/core/transport/static_metadata.h

src/csharp/Grpc.Core.Tests/GrpcEnvironmentTest.cs