add CollectionUser span to add ability to style collection user part in search breadcrumbs

git-svn-id: http://svn.resourcespace.org/svn/resourcespace@5619 c08608d7-6e46-0410-86ca-f2a6f1370df5
take plugins priority into account when loading plugins (in accordance to wiki)

git-svn-id: http://svn.resourcespace.org/svn/resourcespace@5620 c08608d7-6e46-0410-86ca-f2a6f1370df5