title: MagicalRecord MR_importFromObject not saved
body: <p>i have issues importing json with MR.</p>
  
  <p>i had set <code>mappedKeyName</code> of name as name, order as order</p>
  
  <p>This is my json</p>
  
  <pre><code>[{"order":0,"name":"out and about"},
  {"order":1,"name":"entertainment"},
  {"order":2,"name":"get creative"},
  {"order":3,"name":"chill"},
  {"order":4,"name":"get active"},
  {"order":5,"name":"get connected"},
  {"order":6,"name":"fresh start"},
  {"order":7,"name":"totally random"},
  {"order":8,"name":"my favs"}]
  
  
  -(void)importCategoryData
  {
      NSError* err = nil;
      NSString* dataPath = [[NSBundle mainBundle] pathForResource:@"category" ofType:@"json"];
      NSArray *preFillDataDict = [NSJSONSerialization JSONObjectWithData:[NSData dataWithContentsOfFile:dataPath]
                                                  options:kNilOptions
                                                    error:&amp;err];
      NSLog(@"preFillDataArray testArray: %@", preFillDataDict);
  
      [MagicalRecord saveWithBlock:^(NSManagedObjectContext *localContext)
      {
          for (NSDictionary *catObj in preFillDataDict)
          {
              Planningcategory *planCat = [Planningcategory MR_importFromObject:catObj inContext:localContext];
              NSLog(@"asa");
          }
      }
      completion:^(BOOL success, NSError *error) {
          NSLog(@"Success %d error %@",success,error);
      }];
  }
  </code></pre>
  
  <p>Log given:</p>
  
  <pre><code>NO CHANGES IN ** saveWithBlock:completion: ** CONTEXT - NOT SAVING
  Success 0 error (null)
  </code></pre>
  
  <p>Any comments or point are greatly appreciated.</p>
  
  <p>Cheers</p>