adding household_units to person creation #2580
fixing failing tests #2580

Now a person has a household when created.
Add rank to models #2580

centralized the find/create method for the person
household unit
Merge branch 'develop' into bug_2580_ensure_household_and_dwelling_units_are_properly_created_for_new_participants

Conflicts:
	app/models/operational_data_extractor/base.rb
	spec/models/operational_data_extractor/base_spec.rb
Merge pull request #188 from NUBIC/bug_2580_ensure_household_and_dwelling_units_are_properly_created_for_new_participants

adding household_units to person creation #2580