This is the only minor thing that I'm not very happy about, i.e. now the module is dependent on our global vars while previously it was completely standalone.

It would be cool to have a way to inject this value independently and if it's not injected have it default to 0, something like:

```javascript
define('wikia.cachebuster', ['wikia.window'], function(win){
    return win.wfStyleVersion;
});

require([require.optional('wikia.cachebuster')], function(cb){
    var cacheVary = cb || 0;
});

//or
require([require.optional('wikia.window')], function(win){
    var cacheVary = (win) ? win.wgStyleVersion || 0;
});
```