Exercise integration tests with the storage

[kpanic]

Remove the store_mock https://github.com/kpanic/pollicino/blob/master/tests/test_geocoder.py#L13 but keep the geocoder_mock

Currently fuzzy search is not fully functional since we use the standard analyzer when searching The integration test should exercise the "prefix query" that is part of https://github.com/kpanic/pollicino/blob/master/pollicino/store.py It would be nice to test https://github.com/kpanic/pollicino/blob/master/pollicino/store.py or directly the https://github.com/kpanic/pollicino/blob/master/pollicino/geocoder.py

[kpanic]

@luminitacristinalazarescu this might be a nice task for you ;)