Merge github.com:grpc/grpc into really-really-finish-the-stream

src/core/iomgr/tcp_posix.c

src/node/src/server.js

src/node/test/surface_test.js

src/ruby/ext/grpc/extconf.rb

src/ruby/ext/grpc/rb_byte_buffer.c

src/ruby/ext/grpc/rb_byte_buffer.h

src/ruby/ext/grpc/rb_call.c

src/ruby/ext/grpc/rb_call.h

src/ruby/ext/grpc/rb_channel.c

src/ruby/ext/grpc/rb_channel.h

src/ruby/ext/grpc/rb_channel_args.c

src/ruby/ext/grpc/rb_channel_args.h

src/ruby/ext/grpc/rb_completion_queue.h

src/ruby/ext/grpc/rb_credentials.c

src/ruby/ext/grpc/rb_credentials.h

src/ruby/ext/grpc/rb_grpc.h

src/ruby/ext/grpc/rb_server.c

src/ruby/ext/grpc/rb_server.h

src/ruby/ext/grpc/rb_server_credentials.c

src/ruby/ext/grpc/rb_server_credentials.h