US793 Implementér 'work' fra den konceptuelle model  - check in of code which removes book from Valhal and adds ordered representation functionality to Work
Merge branch 'master' into conceptual_model

Conflicts:
	app/models/concerns/person/author.rb
	app/models/concerns/person/concerning.rb
	app/views/people/show.html.erb
	spec/requests/people_spec.rb
	spec/support/person/author.rb
	spec/support/person/concerning.rb
	spec/views/integration/relationships_person_book_work_view_integration_spec.rb