* nodes method returns list of nodes intead of number of nodes * edges method returns list of edges using @relations instead of @graph   * use nodes.length and edges.length instead of nodes and edges method * removed clear_relations!, to_relations to ensure edges method works * removed accessor for @relations to ensure user can't change it
* nodes method returns list of nodes intead of number of nodes
* edges method returns list of edges using @relations instead of @graph
  * use nodes.length and edges.length instead of nodes and edges method
* removed clear_relations!, to_relations to ensure edges method works
* removed accessor for @relations to ensure user can't change it

csw/bioruby-phyloxml