Dummy query-string..

Hi!

Kinda noticed that there isn't a query string appended at the end of the css stylesheet filenames to force the browser to reload the stylesheets for the D6 version. Don't think it's a major thing but I think might be a bit helpful. Got it from drupal_get_css().

A dummy query-string is added to filenames, to gain control over browser-caching. The string changes on every update or full cache flush, forcing browsers to load a new copy of the files, as the URL changed.