Added DataPersisterInMemory unit test.
Added JUnit dependency to POM.
Added additional methods in DataPersisterInMemory class to support deleting all data and reading all geohashes and debris objects.
Added a call to setPoint() in Debris constructor to create a LatLng point on instatiation.
Implemented DebrisDAO.isDebrisInRange() and DebrisDAO.getAllCoordinatesInRange() using SimpleLatLng's CircularWindow implementation to find points within range.
Added DebrisDTO.removeAllDebris() method to remove all debris objects from in memory data store.