Extracted a new class: NTDCoreDataTableViewController.

Refactored some common things of a UITableViewController which is based on CoreData into this class.

NTDCoreDataTableViewController.h

@@ -0,0 +1,25 @@
+//
+//  CoreDataTableViewController.h
+//  
+//
+//  Created by Nicholas Tian on 3/2/14.
+//  Copyright (c) 2014 Nicholas Tian. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface NTDCoreDataTableViewController : UITableViewController
+
+#pragma mark - Abstract Properties and Methods
+@property (nonatomic, strong) NSFetchedResultsController *fetchedResultsController;
+
+// Returns identifier for UITableViewCell.
+- (NSString *)cellIdentifier;
+
+// Called in tableView:cellForRowAtIndexPath:.
+- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath;
+
+// Called in the getter of fetchedResultsController.
+- (NSFetchedResultsController *)newFetchedResultsController;
+
+@end