Change-Id: Ic030af03851e3c0d856029de807aa239a6e08b47
Reviewed-by: Casper van Donderen <casper.vandonderen@nokia.com>
Reviewed-by: Virva Auvinen <virva.auvinen@nokia.com>

Updated qdoc to remove hard-coded dependencies on style sheets.
Simplified the offline documentation, introducing an offline.css
file to be used for documentation in Qt Creator.