Inserting a new managed object in Core Data

core data 中对象的插入，详情请看：http://stackoverflow.com/questions/10732785/inserting-a-new-managed-object-in-core-data

文章中又引出的一片文章：http://stackoverflow.com/questions/3868514/is-there-a-way-to-instantiate-a-nsmanagedobject-without-inserting-it