code: function getEdgeViewsOf(view) {
          return getRefsTo(view, function (ref) {
              return (ref instanceof Core.EdgeView) &&
                     (ref.head === view || ref.tail === view);
          });
      }
docs: Return all instances of EdgeView linked to the given view.
  @param {Core.View} view View element. Typically an instance of NodeView.
  @return {Array<Core.EdgeView>} Instances of EdgeView linked to.