Merge github.com:grpc/grpc into shindig

BUILD

Makefile

build.yaml

doc/PROTOCOL-HTTP2.md

src/core/client_config/resolvers/zookeeper_resolver.c

src/core/iomgr/tcp_client_windows.c

src/core/support/log_posix.c

src/csharp/ext/grpc_csharp_ext.c

templates/gRPC.podspec.template

test/core/end2end/dualstack_socket_test.c

tools/dockerfile/grpc_java_base/Dockerfile

tools/doxygen/Doxyfile.c++

tools/doxygen/Doxyfile.c++.internal

tools/run_tests/sources_and_headers.json

vsprojects/grpc++_unsecure/grpc++_unsecure.vcxproj

vsprojects/grpc++_unsecure/grpc++_unsecure.vcxproj.filters

vsprojects/vcxproj/grpc++/grpc++.vcxproj

vsprojects/vcxproj/grpc++/grpc++.vcxproj.filters

vsprojects/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj

...s/vcxproj/grpc++_unsecure/grpc++_unsecure.vcxproj.filters