Add test case for object members with undefined value. See also issue 27
Add test case for object members with undefined value. See also issue 27

Krinkle/jquery-json,jkesselring/jquery-json,allsmy/jquery-json,yangxing-star/jquery-json,Krinkle/jquery-json,yangxing-star/jquery-json,allsmy/jquery-json,an-yun/jquery-json,timedepths/jquery-json,timedepths/jquery-json,an-yun/jquery-json,jkesselring/jquery-json