Revert "Force DataMapper to raise an exception if a non-mocked DB call is made"

This reverts commit a002462d21241c8858c4e8e8886423398d9ad810.
Revert "Replaced 'create' method with 'new' on solution's spec (WiP)"

This reverts commit fb94be69f54f75e85bd4dc7ac1a5cc79745c1546.