appropriating Shailen's excellent Futures intro into tutorial

src/site/docs/tutorials/indexeddb/index.markdown

 ---
 layout: default
 title: "Use IndexedDB"
 description: "Use IndexedDB for persistence and offline capability for your app."
 has-permalinks: true
 tutorial:
   id: indexeddb
 next: 
 next-title: "Home"
 prev: forms/
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 and uses Polymer data-bindings to keep the View in sync.
 Also, it uses Timer events to trigger updates in the Model.
 
 ###The libraries used by the count_down app 
 
 The count_down app uses the following libraries:
 
 | Library | Description |
 |---|---|
 | <a href="https://api.dartlang.org/dart_indexed_db.html" target="_blank">dart:indexed_db</a> | Save data into an indexed database for persistence and offline capability |
-| <a href="https://api.dartlang.org/dart_async.html" target="_blank">dart:async</a> | Perform tasks asynchronously |
+| <a href="https://api.dartlang.org/dart_async.html" target="_blank">dart:async</a> | Perform tasks asynchronously with Futures |
 | <a href="https://api.dartlang.org/dart_core.html" target="_blank">dart:core</a> | Use DateTime and Duration to manage time-related tasks |
 | <a href="https://api.dartlang.org/polymer.html" target="_blank">Polymer</a> | Create UIs with custom elements and data binding. |
 {: .table }
 
 This tutorial explains the Dart API for IndexedDB used by the count_down app.
 
 <aside class="alert alert-info" markdown="1">
 <strong>Note:</strong>
 This tutorial does not cover Futures or Polymer.
 For information about Futures,
 see
-<a href="/articles/using-future-based-apis/">Using Future Based APIs</a>
+<a href="/docs/tutorials/futures/">Use Future-Based APIs</a>
 and 
 <a href="/articles/futures-and-error-handling/">Futures and Error Handling</a>.
 For information about Polymer,
 refer to <a href="/docs/tutorials/polymer-intro/">Define a Custom Element</a>.
 
 </aside>
 
 ##Details about IndexedDB
 
 Some important facts you need to know about IndexedDB:
@@ skipping 485 matching lines @@
 is passed to the callback function.
 Use `cursor.key` to get the key for the record just retrieved.
 Use `cursor.value` to get the value for that record.
 
 The _loadFromDB method returns a Future that returns the length of the stream.
 
 ##Other resources
 
 <ul>
   <li> For information about Futures, see
-  <a href="/articles/using-future-based-apis/">Using Future Based APIs</a>
+  <a href="/docs/tutorials/futures/">Use Future-Based APIs</a>
   and 
   <a href="/articles/futures-and-error-handling/">Futures and Error Handling</a>.
   </li>
   <li>
   For information about Polymer,
   read <a href="/docs/tutorials/polymer-intro">Define a Custom Element</a>.
   </li>
 </ul>
 
 ###What next?
 
 You've completed the tutorials!
 Check out the Dart
 [code samples](/samples/) and [articles](/articles/).
 
 {% endcapture %}
 
 {% include tutorial.html %}