Export new layout types (#555)

Author: latonv

index.ts

@@ -18,6 +18,7 @@ export { ItemTile } from './src/tiles/grid/item-tile';
 export { TileList } from './src/tiles/list/tile-list';
 export { TileListCompact } from './src/tiles/list/tile-list-compact';
 export { TileDispatcher } from './src/tiles/tile-dispatcher';
+export { LayoutType } from './src/tiles/models';
 export {
   SmartQueryHeuristic,
   KeywordFacetMap,