Add person object fields

For #9
Remove contact name/title, and add affiliation string to Person
Add timed items

For #9
Add timed item to formats list
Change TimedEdition#closes_at to end_date
Change person rendering app to www
Merge pull request #10 from theodi/person-fields

Add person object fields
Make PersonEdition attach with metadata
Merge pull request #18 from theodi/person-edition-attach-with-metadata

Make PersonEdition attach with metadata
Merge pull request #11 from theodi/timed-items

Add timed items
Merge branch 'article-editions' of git://github.com/theodi/odi_content_models

Conflicts:
	app/decorators/models/artefact_decorator.rb
	lib/odi_content_models/test_helpers/factories.rb