Add support for volume pricing based on pricing bands #75
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This allows discounts to be set on the actual quantities which end up in the specific range, with the rest calculated on the full price (or the respective discount set up for that band)
Main caveat is that first a per-item price is calculated and then backfilled for the total, which due to rounding down to cents which could be lower than what you expect. If quantities above 100 are expected it is important to set up the pricing to cater for this difference. This caveat also applied to percent based discounts as well even before this change however, this has been added to the README to make it clear.