Implement BillingId support #48
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In some organisations card billing tokens are shared across systems and it's easier to use a local billing ID (like the customer number) instead of the DPS billing ID. This is explicitly supported by DPS through the BillingId parameter which the library can't currently handle, as the card reference is presumed to be the DpsBillingId.
I've implemented it as an alternative billingId parameter here, though it might be neater to continue to use cardReference with either an option to say that it's a BillingId, or a prefix on the reference to say so. That would be more in keeping with the Omnipay interface...
I haven't written tests for this yet, I thought I'd see whether this is the preferred approach first. Happy to write tests once we have a solid approach.