Support for multi-valued address field; also record deletion

[jmay]

• address data can be specified in new-record attributes
• multiple addresses, each with a label; duplicate labels are allowed
• address update not yet supported
• person.delete!

[alexrothenberg]

Thank you so much for this awesome pull!

I added you as a collaborator in case you have more good ideas and want to add them in directly without going through the pull request process.