Custom port for app.js server with arguments

[Glavin001]

Custom port for app.js server with arguments.

Usage:

node app.js --port 8081

Where default port is 8080.

[Glavin001]

Use https://github.com/substack/node-optimist or use: https://github.com/visionmedia/commander.js/

Looks like Commander.js has the highest number of Stars and also looks very complete.