[Nitro] STI refactoring

[Jonathan Buch]

Hi,

> Attached find a bundle for a preliminary refactoing to pull the
> conditional behaviors across Og into simple method overrides in
> Og::SchemaInheritance.  A little quicker, and cleaner code.

if you continue like that, you're gonna be my new hero.  O.O

That STI stuff bugged me for a long time, I just didn't know how
to make it go away.....

Jo

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