In CustomizablePagingNavigator change super(id, pageable, null) to super(id, pageable, labelProvider) when we have moved to latest wicket version > rev 604918

TODO : org.apache.wicket.markup.html.navigation.paging.PagingNavigation in wicket-1.3.0-rc2.jar contains a bug regarding paging when a non-null labelProvider is provided. This is already fixed in trunk (revision 604918). When this commit makes it to a release use the following constructor to enable a custom label provider:
super(id, pageable, labelProvider);