Fixed issue with error message not appearing

Fix due to issue #24. Because the #additives route redirects to
 #additives/category1 the 'route-found' event is triggered twice. This
 effectively hides the error dialog box. The 'changed' sammyjs event is
 used now. This event is triggered only when content of the pane div is
 about to change.
Added category name in breadcrumbs on adtv. page

Related to issue #24. It should be possible to go back to the category
additive list for the category that the currently viewed additive resides
in.