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

build.yaml

doc/g_stands_for.md

grpc.def

include/grpc++/create_channel.h

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

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

include/grpc/grpc.h

src/core/lib/channel/http_client_filter.c

src/core/lib/iomgr/error.h

src/core/lib/iomgr/ev_epoll_linux.c

src/core/lib/surface/version.c

src/ruby/ext/grpc/rb_grpc_imports.generated.c

src/ruby/ext/grpc/rb_grpc_imports.generated.h

templates/src/core/lib/surface/version.c.template

test/core/end2end/tests/bad_hostname.c

test/core/end2end/tests/binary_metadata.c

test/core/end2end/tests/call_creds.c

test/core/end2end/tests/cancel_after_accept.c

test/core/end2end/tests/cancel_after_client_done.c

test/core/end2end/tests/cancel_after_invoke.c