Adding Billing Administrator and Purchaser roles

These roles are required for the Store release

@olegrise Please review. Previously I've deployed these changes manually, as needed, but apparently they should just go in now, so I've rebased this branch that @alex-deaconu originally created.
Hmmm, I couldn't say what was intended. @alex-deaconu Can you provide insight here?

Actually, after thinking about it, this looks like it is ensuring that the current user is of the Rise company, and their selected company is also Rise (meaning they have not "selected" a sub company, so it's defaulted to their own company). Does that make sense?