create css generator

Create CSS generator to use flag sheets in HTML. As for example jQueryUI stores all icons in one image, we could use flag sheet. Therefore you need a css file containing position of each individual flag.
Example:

    .flag {
        height: 30px;
        width: 40px;
        background-image: url("res-40x30-transparent.png");
        background-repeat: no-repeat;
        display: block;
        overflow: hidden;
        text-indent: -99999px;
        background-position: -360px -480px;
    }
    .flag-gb { background-position: -40px -150px; }

HTML usage:

    <link rel="stylesheet" type="text/css" href="res-40x30-transparent.css">
    <span class="flag flag-gb"></span>

#### TODOs/Drawbacks:
* As I'm not so familiar with perl I wrote the CSS generator in python.
* the css generator creates also example HTML file, which should probably be part of the examples.