update polymer related info to 0.8.7

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

 ---
 layout: default
 title: "Get Input from a Form"
 description: "Using HTML forms and input elements to send data to a server"
 has-permalinks: true
 tutorial:
   id: forms
 next: indexeddb/
 next-title: "Use IndexedDB"
 prev: fetchdata/
@@ skipping 51 matching lines @@
 (a form with many kinds of input elements),
 and keep the interface in sync with Dart data.
 The client and server communicate using
 several classes from the core Dart library,
 including streams, Futures, HttpRequest, and so on.
 The server uses CORS headers to allow cross-origin requests.
 
 <aside class="alert alert-info" markdown="1">
   <strong>Note:</strong>
   This tutorial assumes that you have read
-  [Define a Custom Elment](/docs/tutorials/polymer-intro/)
+  [Define a Custom Element](/docs/tutorials/polymer-intro/)
   and [Fetch Data Dynamically](/docs/tutorials/fetchdata/)
   and are familiar with Polymer, JSON, and HttpRequest.
 </aside>
 
 
 * [About forms, generally](#about-forms)
 * [About the slambook example, specifically](#about-the-slambook-example)
 * [Submitting a form](#submitting-a-form)
 * [Resetting a form](#resetting-a-form)
 * [Creating a server and listening on a port](#creating-a-server)
@@ skipping 147 matching lines @@
 Enter some data and push the **Submit** button.
 
 <iframe class="running-app-frame"
         style="height:500px;width:525px;"
         src="examples/slambook/out/web/slambook.html">
 </iframe>
 
 <aside class="alert">
 <strong>Version Note:</strong> The slambook app
 is compatible with 
-<a href="https://pub.dartlang.org/packages/polymer#versions">polymer.dart 0.8.1</a>.
+<a href="https://pub.dartlang.org/packages/polymer#versions">polymer.dart 0.8.7</a>.
 </aside>
 
 The request gives you an innocent stare and displays "No server"
 because you are not running the server on your machine.
 Let's fix that.
 
 ###Run the server
 
 Get the source code for the basic server program,
 slambookserver.dart,
@@ skipping 68 matching lines @@
 {% endprettify %}
 
 Note the absence of either an `action` or a `method` attribute.
 Instead, the behavior for the submit button is coded in a Dart
 mouse click handler.
 Below is the HTML code that creates the submit button
 and binds it to a Dart mouse click handler.
 
 {% prettify html %}
 <div class="submitarea">
-  <input type="submit" value="Submit" on-click="submitForm($event)">
+  <input type="submit" value="Submit" on-click="{%raw%}{{submitForm}}{%endraw%}">
   ...
 </div>
 {% endprettify %}
 
 Here's the code for the submitForm() mouse click handler:
 
 ![Making a post request](images/post-request.png)
 
 Let's walk through the click handler's code.
 
@@ skipping 405 matching lines @@
 and one in dart:io (for servers).
 
 | Resource | Library | Description |
 |---|---|
 | <a href="https://api.dartlang.org/dart_html/HttpRequest.html" target="_blank">HttpRequest</a> | dart:html | Client-side HTTP request |
 | <a href="https://api.dartlang.org/dart_io/HttpRequest.html" target="_blank">HttpRequest</a> | dart:io | Server-side HTTP request |
 | <a href="https://api.dartlang.org/dart_io/HttpServer.html" target="_blank">HttpServer</a> | dart:io | Server-side object to handle HTTP communication with clients |
 | <a href="https://api.dartlang.org/dart_io/HttpResponse.html" target="_blank">HttpResponse</a> | dart:io | Server-side object to carry response to client requests |
 | <a href="https://api.dartlang.org/dart_async/Stream.html" target="_blank">Streams</a> | dart:async | A stream of data |
 | <a href="https://api.dartlang.org/dart_async/Future.html" target="_blank">Future</a> | dart:async | A way to get a value asynchronously |
-| <a href="https://api.dartlang.org/dart_json.html" target="_blank">stringify()</a> | dart:convert | A library with resources for converting an object into a JSON string |
+| <a href="https://api.dartlang.org/dart_convert.html#JSON" target="_blank">JSON</a> | dart:convert | The default implementation of a JSON converter |
 | <a href="https://api.dartlang.org/polymer.html" target="_blank">Polymer</a> | Polymer | Custom elements, data binding, templates |
 {: .table}
 
 ##Two-way data binding using Polymer {#binding-data}
 
 The slambook sample uses Polymer's two-way data binding to
 bind the values of input elements to Dart variables.
 If the user changes the value in an input element,
 the bound variable in the Dart code automatically changes.
 Or if the Dart code changes the value of the bound variable,
@@ skipping 194 matching lines @@
 ###What next?
 
 The next tutorial,
 [Use IndexedDB](/docs/tutorials/indexeddb),
 describes how to save data on the client
 in the browser's Indexed Database.
 
 {% endcapture %}
 
 {% include tutorial.html %}