[Examples, Build] Moving some smaller / less useful examples to a separate directory, speeding up builds.

examples_extra/CollectionViewWithViewControllerCells/Sample/MosaicCollectionViewLayout.h

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+//
+//  MosaicCollectionViewLayout.h
+//  Sample
+//
+//  Created by McCallum, Levi on 11/22/15.
+//  Copyright (c) 2015 Facebook. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import <AsyncDisplayKit/AsyncDisplayKit.h>
+
+@interface MosaicCollectionViewLayout : UICollectionViewLayout
+
+@property (assign, nonatomic) NSUInteger numberOfColumns;
+@property (assign, nonatomic) CGFloat columnSpacing;
+@property (assign, nonatomic) UIEdgeInsets sectionInset;
+@property (assign, nonatomic) UIEdgeInsets interItemSpacing;
+@property (assign, nonatomic) CGFloat headerHeight;
+
+@end
+
+@protocol MosaicCollectionViewLayoutDelegate <ASCollectionViewDelegate>
+
+- (CGSize)collectionView:(UICollectionView *)collectionView layout:(MosaicCollectionViewLayout *)layout originalItemSizeAtIndexPath:(NSIndexPath *)indexPath;
+
+@end
+
+@interface MosaicCollectionViewLayoutInspector : NSObject <ASCollectionViewLayoutInspecting>
+
+@end