Merge github.com:grpc/grpc into make_a_full_request

BUILD

Makefile

binding.gyp

build.yaml

gRPC.podspec

src/core/client_config/resolvers/dns_resolver.c

...nt_config/subchannel_factory_decorators/add_channel_arg.h

...config/subchannel_factory_decorators/merge_channel_args.c

...config/subchannel_factory_decorators/merge_channel_args.h

src/core/transport/chttp2/hpack_parser.c

src/core/transport/chttp2/varint.h

src/ruby/pb/test/client.rb

src/ruby/pb/test/server.rb

test/core/bad_client/tests/headers.c

test/core/surface/completion_queue_test.c

test/core/transport/chttp2/varint_test.c

tools/doxygen/Doxyfile.core.internal

tools/run_tests/sources_and_headers.json

tools/run_tests/tests.json

vsprojects/buildtests_c.sln