Dev: Update how variable priced options are added to work with EDD 3.0.
Tweak: Update plugin author to "Sandhills Development, LLC".
Tweak: Use item_id in automatic updater for better reliability.
Fixed: Purchase count calculation on variable priced products not taking price ID into account.
Fixed: Performance improvement when getting purchase counts for a product.
Fixed: Purchase records being looked up on items that do not have purchase limits enabled.
Tweak: Restructured file organization.
