Dry up some methods in NullRecord::FinderMethods.
Dry up some methods in NullRecord::FinderMethods.

Things were getting a little out of hand. There was a lot of duplicated
code among all of the finder methods that don't take arguments. This
commit refactors them to a way of dynamically defining them from an
array.

alexstophel/null_record,alexstophel/null_record