Include owning_app in artefacts index output.

Needed to seed reserved URLs in the url-arbiter.
Merge pull request #201 from alphagov/add_owning_app_to_index

Include owning_app in artefacts index output.
Editions can be marked as being in beta

www.agileplannerapp.com/boards/173808/cards/5418

As a GDS content designer
I want to show GOV.UK end users that a piece of
mainstream content is not yet the official source
and is still in beta
So that I can trial content with the public and
gather evidence to make it even better
Merge pull request #202 from alphagov/mark-edition-in-beta

Editions can be marked as in beta