CoreData 사용하기
나중에 수정하고 일단 링크 붙여 넣음..
#1
http://www.raywenderlich.com/934/core-data-tutorial-for-ios-getting-started
#2
http://www.raywenderlich.com/12170/core-data-tutorial-how-to-preloadimport-existing-data-updated
#3
http://www.raywenderlich.com/999/core-data-tutorial-for-ios-how-to-use-nsfetchedresultscontroller