closes issue #100. make the dependency logic in Binding.unbind the same as Binding.bind
closes issue #100. make the dependency logic in Binding.unbind the same as Binding.bind

nopnop/rivets,GerHobbelt/rivets,GerHobbelt/rivets,kangax/rivets,moneyadviceservice/rivets,MishaMykhalyuk/rivets,benderTheCrime/tiny-rivets,jccazeaux/rivets,QAPInt/rivets,MishaMykhalyuk/rivets,jccazeaux/rivets,re-clone/rivets,GerHobbelt/rivets,jccazeaux/rivets,nopnop/rivets,nopnop/rivets,re-clone/rivets,altmind/rivets,altmind/rivets,altmind/rivets,QAPInt/rivets,mikeric/rivets,zongkelong/rivets,mikeric/rivets,zongkelong/rivets,zongkelong/rivets,npmcomponent/mikeric-rivets,re-clone/rivets,mikeric/rivets,MishaMykhalyuk/rivets,QAPInt/rivets