You'll probably want NodeBB to run in the foreground, and not pipe output to the log file, if you want to use forever or upstart.
node loader.js --no-silent --no-daemon will run production mode and leave output piping to stdout. It will also run in the foreground, which forever expects.
If you use app.js, you won't need --no-daemon, but you'll only be running one process.
Anyway here's the picture:
I had to use PNG as ICO isn't supported