simplify add() to use 'ary[]' syntax
simplify add() to use 'ary[]' syntax

wjb12/backbone-nested,wjb12/backbone-nested,GerHobbelt/backbone-nested,Mordentware/backbone-nested,afeld/backbone-nested,Mordentware/backbone-nested,Jaspersoft/backbone-nested,afeld/backbone-nested,Jaspersoft/backbone-nested