Auto map fieldnames

This project could support enabling auto translation or auto mapping of java field names to database columns based on the following convention:

`Query` now supports ability to enable auto column mapping.
```
private String fieldOne;
private String fiendNumber2;
```
maps to database column: field_one and field_number_2 respecitvely if enabled

This would cut down on lots of unnecessary calls to `addColumnMapping` just to get what could be considered default mappings supported my most (all?) other ORM libraries.

This feature can be enabled by calling `query.setAutoDeriveColumnNames(true)` and that setting lasts for the duration of the query.