If you need a minifier for CSS and JS assets, feel free to explore Minify.
Minify is a PHP5 app that helps you follow several rules for client-side performance. It combines multiple CSS or Javascript files, removes unnecessary whitespace and comments, and serves them with gzip encoding and optimal client-side cache headers.
Ensure the min directory lives at the project root of your file server, then you can begin concatenating and minifiying your css and js assets into one source. See below,
//If you externally link assets such as,
<link rel="stylesheet" href="css/bootstrap.min.css">
<link rel="stylesheet" href="css/main.css">
<script src="js/jquery-1.8.0.min.js"></script>
<script src="js/jquery.total-storage.min.js"></script>
//Concatenate them like so,
<link rel="stylesheet" href="min/?f=css/bootstrap.min.css,css/main.css">
<script src="min/?f=js/jquery-1.8.0.min.js,js/jquery.total-storage.min.js,js"></script>