Implement simple horizontal paging node

AsyncDisplayKit/ASPagerNode.h

@@ -0,0 +1,29 @@
+//
+//  ASPagerNode.h
+//  AsyncDisplayKit
+//
+//  Created by Levi McCallum on 12/7/15.
+//  Copyright © 2015 Facebook. All rights reserved.
+//
+
+#import <AsyncDisplayKit/AsyncDisplayKit.h>
+
+@protocol ASPagerNodeDataSource;
+
+@interface ASPagerNode : ASCollectionNode
+
+@property (weak, nonatomic) id<ASPagerNodeDataSource> dataSource;
+
+- (void)reloadData;
+
+- (void)setTuningParameters:(ASRangeTuningParameters)tuningParameters forRangeType:(ASLayoutRangeType)rangeType;
+
+@end
+
+@protocol ASPagerNodeDataSource <NSObject>
+
+- (NSInteger)numberOfPagesInPagerNode:(ASPagerNode *)pagerNode;
+
+- (ASCellNode *)pagerNode:(ASPagerNode *)pagerNode nodeAtIndex:(NSInteger)index;
+
+@end