Completes merge

examples/tips/client.h

examples/tips/client_main.cc

src/core/channel/call_op_string.c

src/core/channel/connected_channel.c

src/core/httpcli/format_request.c

src/core/support/string.c

src/core/support/string.h

src/core/surface/event_string.c

src/node/client.js

src/node/examples/math_server.js

src/node/interop/interop_client.js

src/node/server.js

src/node/surface_client.js

src/node/surface_server.js

src/node/test/client_server_test.js

src/node/test/interop_sanity_test.js

src/node/test/surface_test.js

src/ruby/README.md

src/ruby/spec/client_server_spec.rb

test/core/channel/metadata_buffer_test.c