Update app.js

Only check if file exists when no other supported --arguments are given.
Display that 0.0.0.0 is Any Address.
Moved upgrade section to after install section.
added CLI --help!
Merge branch 'cli-help' of https://github.com/RefinedSoftwareLLC/NodeBB into RefinedSoftwareLLC-cli-help

Conflicts:
	app.js
fixed notifications not exiting (whoops)
Merge branch 'master' of github.com:designcreateplay/NodeBB