* be able to sort dashboard articles (#1837)
* remember to escape order clause is arel (#1837)
* add back in missing character for created_at (#1837)
* use case statement to avoid threat of injection (#1837)
* write specs to ensure sorting works for dashboard articles (#1837)
* add publish sort options, refactor sort options into articles helper (#1837)
* refactor to use model scope (#1837)