Optimize javascript using minify

"It combines multiple CSS or Javascript files, removes unnecessary whitespace and comments, and serves them with gzip encoding and optimal client-side cache headers."

Example of interesting urls:
* http://dev.bigproject/min/?f=static/map.js
* http://dev.bigproject/min/?b=static&f=map.js,taskpane.js,OpenLayers-2.8.js
* http://dev.bigproject/min/?g=js

Few challenges during setup
* 400 Bad Request -- check your path in config.php, especially $min_documentRoot