Added geolocation (new); surfaced appcache and webaudio samples

src/site/samples/appcache/index.markdown

 ---
 layout: default
 title: Using Application Cache
 live_example_url: example/index.html
 
 header:
   css: ["/samples/samples.css"]
 ---
 
 ## {{ page.title }}
 
 A simple example to show the use of the Application Cache interface.
 
 For a thorough exploration of this topic, read
 [A Beginner's Guide to Using the Application
 Cache](http://www.html5rocks.com/en/tutorials/appcache/beginner/),
 an article by Eric Bidelman originally published on HTML5Rocks.
 
 Application Cache allows you to specify which files the browser should cache
 and make available to offline users. Your app will
 load and work correctly, even if the user presses the refresh button while
 offline.
 
 You can open the example in Dart Editor and run it by clicking `index.html`.
-Or, you can try this
-[live demo](http://www.dartlang.org/samples/appcache/).
 
 To see this example in action, make changes to `index.html` and then reload
 the app. Your changes don't show up because the browser displays a cached
 version of `index.html`. Next, change the date or version number in
 appcache.mf, and reload once more. You'll be prompted to load the new version.
 
 Read the
 [source](https://github.com/dart-lang/dart-samples/tree/master/web/html5/appcache/beginner).
 
 <iframe class="running-app-frame"
         style="height:500px;width:100%;"
         src="{{page.live_example_url}}">
 </iframe>
 
 See all [samples](/samples/).