Add feature for super interface builder.

https://github.com/davidmarquis/fluent-interface-proxy/issues/3

Add feature for super interface builder.
1) please re-indent
2) the test tries to test too much, it should only cover the new feature, that is ascending in parent classes to find fields. 
if you feel like there should be tests for new field types (Calendars, Enums, etc.) then specific tests should cover these features