Update to yaml_db to 0.2.5; adjust dump method for fixed up unhashing method
Use #map when dumping record fields

/cc @Tho85
Do not dump tables which will be truncated anyway
Refactor and fix for using alternate serialization helper classes
Add JSON serializer classes

- update yaml_db_with_schema_tables to 0.3.0 (needed for JSON support)
Merge pull request #1 from zweitag/json-db

JsonDb support