Improve Material ink effects

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

 // 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/components/material.dart';
+import 'package:sky/framework/components/ink_well.dart';
 import 'package:sky/framework/fn.dart';
 import 'package:sky/framework/theme/typography.dart' as typography;
 import 'stock_arrow.dart';
 import 'stock_data.dart';
 
 class StockRow extends Component {
   static final Style _style = new Style('''
     transform: translateX(0);
     display: flex;
     align-items: center;
@@ skipping 45 matching lines @@
         style: _lastSaleStyle,
         children: [new Text(lastSale)]
       ),
       new Container(
         key: 'Change',
         style: _changeStyle,
         children: [new Text(changeInPrice)]
       )
     ];
 
-    return new Material(
+    return new InkWell(
       style: _style,
       children: children
     );
   }
 }