New services:
 - children service
 - siblings service
 - featureInfo service

 Services modifications:
 - countryInfo accepts also ISO2 code of the country

 Misc:
 - SQL statements logging enabled
  - JSON generation moved to separate object
Refactoring:
- services distributed between controllers according to their type (basic, hierarchical, etc).
Stubs:
- CountryCode service
- FindNearby service
- Hierarchy service
- ReverseGeocoding service
Removal of obsolete controller.
SQL example:
- hierarchy query
Removed obsolete route.
Removed obsolete route.
Bugfix:
 - if a feature did not have any entry in name_translation, it could not be accessed.
The Earth and continents import SQL scripts.
Children service initial test.
Children service test - update: removed printing to stdout.
DAO: identified and separated most common code from methods.
Updated children service test.
Cleanup with lat/long.
Implicit conversion to Point for SQL queries, example of function definition
Important: feature.location is not optional (nullable).
Hierarchy service fixed.
FindNearby service fixed, but not fully tested yet.
ST_DWITHIN added to pgSlickDriver.
FindNearby converted to lifted query.
 Introduced jtsGeometryFactory for DAO.