Updated copyright notices to include the year 2018.
global: Replace o_stream_nfinish() with o_stream_finish() whenever possible
iostream-multiplex: Check return values in tests
global: stop including fd-set-nonblock.h & fd-close-on-exec.h directly
lib: iostream-multiplex tests - Fix hangs by setting the pipe fds non-blocking
lib: Add multiplex stream support This allows having multiple channels of data in single stream.