message: Deleted redundant properties
  There are settings in the m file so these properties aren't used
diff: @interface NVBarButtonView : UIView
  @property UIBarButtonItem *button;
  -@property (nonatomic, assign) NSString *title;
  -@property (nonatomic, assign) UIImage *image;
  -@property (nonatomic, assign) UIBarButtonSystemItem systemItem;
  @property (nonatomic, copy) RCTBubblingEventBlock onPress;
  @end
  