feat(html): Center banner uses iframe now, other banners broken.
refactor(less): Split LESS code into better categories.
fix(IE): restructure CSS insertion for old IEs
fix(IE): fix for old IEs that don't support document.head
fix(IE): use JSON encoding for messages, minor fix in CSS
fix(IE): old versions of IE have to request config twice
fix(ajax): better distinction between no-ajax and ajax code
fix(IE): background now explicitly set transparent
fix(IE): modify transparency for background
fix(IE): another fix for IE css opacity
fix(css): css opacity for old IE
fix(IE): remove close button for this IEs that can't handle it
fix(IE): change removal of close button to IE-compatible method
fix(IE): adaption for IE6: thinsp removed, hack for fixed positioning
fix(IE): standard grey background for IE6
fix(IE): banner background for IE6
feat(ajax): activate AJAX requests
fix(IE): CSS fix for background in IE6 and 7
fix(IE): another IE background fix
fix(AJAX): fix URL for in-iframe AJAX request