Make stocks-fn match the style for the Sky SDK

sky/examples/stocks-fn/lib/stock_list.dart

-part of stocksapp;
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:sky/framework/animation/scroll_behavior.dart';
+import 'package:sky/framework/components/fixed_height_scrollable.dart';
+import 'package:sky/framework/fn.dart';
+import 'stock_data.dart';
+import 'stock_row.dart';
 
 class Stocklist extends FixedHeightScrollable {
   String query;
   List<Stock> stocks;
 
   Stocklist({
     Object key,
     this.stocks,
     this.query
   }) : super(key: key, scrollBehavior: new OverscrollBehavior());
 
   List<Node> buildItems(int start, int count) {
     return stocks
       .skip(start)
       .where((stock) => query == null || stock.symbol.contains(
           new RegExp(query, caseSensitive: false)))
       .take(count)
       .map((stock) => new StockRow(stock: stock))
       .toList(growable: false);
   }
 }