Merge github.com:grpc/grpc into idempotent

.clang_complete

BUILD

MANIFEST.md

Makefile

binding.gyp

build.yaml

config.m4

doc/interop-test-descriptions.md

examples/node/README.md

examples/python/helloworld/greeter_client.py

examples/python/route_guide/route_guide_client.py

gRPC.podspec

grpc.gemspec

include/grpc++/generic/async_generic_service.h

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

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

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

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

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

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