WL-172 Show a Order History list on the Student Dashboard for any PaidCo...

...urseRegistration or RegCodeItem that the user might have purchased
@chrisndodge, the receipt url / view is the same for all four items ('PaidCourseRegistration, CourseRegCodeItem, Donation and CertificateItem), but there is a different template for the CertificateItems (verified_cert_receipt.html). The remaining 3 items use receipt.html. Looks like it's just a matter of including all 4 types in the list.