Made Date/DateTime actually convert to a Date Object.
Fixed issue in model preparation where we wouldn't send the backend autoid fields, therefore, we didn't know if this was an existing model or a new one.
Fixed issue in AutoIDField where we'd always return undefined for the prepared value; this was silly and wrong.
auto
to Date & DateTimefirst
to Date & DateTimeundefined
for the prepared value; this was silly and wrong.