Extended generator with ability to add GlobalizationInfoAdjustment classes.

I have added a simple extension point to the **generator**.

This extension point will automatically register any class implementing `IGlobalizationInfoAdjustment` interface (single registration per culture name is allowed) present in the project.

The `IGlobalizationInfoAdjustment.Adjust` method will be called right after creating `GlobalizationInfo` from `CultureInfo`.

An implementation of `IGlobalizationInfoAdjustment` for "pl" and "pl-PL" cultures has been added as well (`PlGlobalizationInfoAdjustment`).

The feature is pretty basic as I didn't want to complicate the **generator** too much (especially when there is no final decision if it will be used in future).