Wrote unit tests for Apartment.
Wrote Property unit tests.
Updated parking_types and apartments acceptance/integration tests to account for users submitting invalid input.
Removed unused attributes from Property.
 Wrote unit tests for ParkingType, updated validations to constrain accepted values for category and on_site, adjusted acceptance test accordingly.
Wrote unit tests to constrain amenity_set attributes to only true/false.
Updated parking_type unit test to allow for nil values.
Returned parking_type acceptance test to its original state (it was fine, the validations needed to be updated to allow nil values in unused forms).
Added acceptance tests for deleting parking types and apartments via cocoon. Updated acceptance tests for creating apartments and parking types to use the Add Another cocoon link.
Ran test suite, got latest coveralls statistics.
Merged in unit-tests