Add country property to Address objects.

lib/address.js
	-Add `country` argument to `Address()` constructor.
	-Assign it as a new property of `Address` objects.

lib/addresses/*.js
	-Update `Address()` calls accordingly.
Update tests to reflect new Address country prop.

test/(openaddresses, osm, tiger).js
	-Update broken tests to reflect the new `Address.country`
	property, added in 82e497c.
Merge branch 'feature/country_prop' into develop

lib/(address.js, addresses/*)
	-Introduce an `Address.country` property.