Exclude archived Spaces and Groups from the breadcrumbs.
Add an 'Archived' tab to the /spaces page.
Don't show archived Spaces on the 'Subscribed' or 'All' tabs in the 'User Spaces' widget.
Allow the $bundle argument to oa_core_get_parents() to be NULL.
Allow the $bundle argument to oa_core_get_groups_by_parent() to be NULL.
Merge pull request #64 from dsnopek/breadcrumbs-archived

Exclude archived Spaces from Breadcrumbs and add an 'Archived' tab to /spaces