Add some options to generate Oracle SQL

* oracle doesn' t support ' AS ' beetwen the tableName and its aliasName => options.explicitTableAs
* oracle doesn' t support aliasName starting whith _ => options.prefixAlias
* oracle need ' instead of " to delimit string value => options.stringDelimiter
* oracle doesn't have a LIMIT criteria and use numbered line to do the same => options.rownum

All default value are configured to genarate the same requests than before.

Correct a bug on  SelectBuilder.prototype.processAggregates function,now support columnName in model's attribute.