added tests for #cousins, #great_grandparents, #great_grandchildren
added options to #uncles_and_aunts and #nieces_and_nephews for detailed returns
added #uncles and #aunts methods that pass options to #uncles_and_aunts
added #nephews and #nieces that pass options to #nieces_and_nephews
added methods for maternal and paternal aunts and uncles
added tests for new methods, #uncles, #aunts, and maternal/paternal variants, also #nieces and #nephews
Merge branch 'new_relational_query_methods' of https://github.com/estensland/genealogy