Added last_revision_created_at to Page
UI for ordering by latest revision
Fixed test
Merge branch 'feature/order-by-last-revision-date' of https://github.com/kaedroho/wagtail into kaedroho-feature/order-by-last-revision-date
Consistently include the word 'ago' when using the timesince filter
release note for #683
Merge branch 'kaedroho-feature/order-by-last-revision-date'