Fix default values SQL on Oracle

[perdjurner]

This test fails for Oracle (it's commented out at the moment):
test_saving_a_new_model_without_properties_should_not_throw_errors

We need to find the proper Oracle syntax for inserting a record with only default values.

For example, on SQL Server it is:
INSERT INTO table DEFAULT VALUES

The $defaultValues function in Oracle.cfc is where we need to put the correct syntax.

[perdjurner]

I assigned this to you @scahyono because I know you have fixed a bunch of Oracle issues recently. Hopefully you can find a fix for this as well :)

[scahyono]

Fixed and back-ported.

[perdjurner]

Nice!