- [feature] Added new capability to relationship

- [feature] Added new capability to relationship
loader options to allow "default" loader strategies.
Pass '*' to any of joinedload(), lazyload(),
subqueryload(), or noload() and that becomes the
loader strategy used for all relationships,
except for those explicitly stated in the
Query.  Thanks to up-and-coming contributor
Kent Bower for an exhaustive and well
written test suite !  [ticket:2351]