Add models folder and losting_spec long_date test.
Add test to verify that Losting.ordered_json returns a maximum of 10 results.
Update long_date to test functionality versus using the same method.
Add test to verify Sighting.long_date returns a date formatted in long_ordinal.
Add test to verify that Sighting.ordered_json returns a maximum of 10 records.
Add tests to ensure that most recent sightings and lostings are returned first after ordered_json call.
Merge pull request #70 from Cheerazar/model_testing

Model testing