Include bbox for items without own geometry?

[rsimon]

The Peripleo v.1 API included a geo_bounds field that contained the geographical coverage of the item. If the items was not a place itself (which has inherent geo-coverage), but an object, the geo_bounds would be based on the places referenced by the object.

New Peripleo no longer has this type of de-normalization. Should we introduce some sort of workaround? Perhaps at least for the legacy interop of issue #118?