SSNs are 9 digits, not 8
Make existing houshold members and landlords editable
Remove some <p> tags from the main form

I don't know why those are there.
Make the <hr> tags proper empty elements
Household members and landlords can be removed
Rename partial person_form to person_fields

Because it's a collection of fields, not a whole form.  Following the style of
http://railscasts.com/episodes/196-nested-model-form-part-1
Allow adding household members and landlords
Identity residence is editable
Distinguish Residence from MailAddress with single table inheritance

This probably won't be sustainable, since people can't share addresses, but it should
at least be quick to get something working.
Use a random state for 742 Evergreen Terrace
Provide random addresses to seed people
mail -> mail_address
Update test fixtures for new address scheme