added front page samples to testing, plus a couple of tweaks to front page and code lab

src/site/codelabs/darrrt/index.markdown

 ---
 layout: default
-title: "Try Dart"
+title: "Write Dart"
 description: "Write some Dart code. Learn some stuff."
 snippet_img: images/piratemap.jpg
 has-permalinks: true
 tutorial:
   id: trydart
 js:
 - url: /js/os-switcher.js
   defer: true
 - url: /js/editor-downloads-analytics.js
   defer: true
 - url: /js/editor-version.js
   defer: true
 header:
   css: ["/codelabs/darrrt/darrrt.css"]
 ---
 
-# {{ page.title }} - Write your first Dart app
+# {{ page.title }}
 
 In this code lab,
 you build a pirate badge generator from a skeleton app.
 The sample app provides a brief look at some Dart language and library features.
 This code lab assumes that you have some programming experience.
 
 <strong>Build this app!</strong>
 
 <iframe class="running-app-frame"
-        style="height:220px;width:530px;"
+        style="height:220px;width:550px;"
         src="examples/6-piratebadge_json/piratebadge.html">
 </iframe>
 
 <hr>
 
 <div class="piratemap" markdown="1" style="min-height:325px">
 
 ## Map
 
 * [Step 0: Set up](#set-up)
@@ skipping 388 matching lines @@
 Use the Run button
 <img src="images/run.png" width="16" height="16"
      alt="Run button">
 in Dart Editor to run the app.
 
 Compare your app to the one running below.
 
 Type in the input field.
 
 <iframe class="running-app-frame"
-        style="height:220px;width:530px;"
+        style="height:220px;width:550px;"
         src="examples/2-inputnamebadge/piratebadge.html">
 </iframe>
 
 #### Problems?
 
 Check your code against the files in `2-inputbadge`.
 
 * [piratebadge.html](https://github.com/dart-lang/one-hour-codelab/blob/master/web/2-inputnamebadge/piratebadge.html)
 
 * [piratebadge.dart](https://github.com/dart-lang/one-hour-codelab/blob/master/web/2-inputnamebadge/piratebadge.dart)
@@ skipping 278 matching lines @@
      alt="Run button">
 in Dart Editor to run the app.
 
 Compare your app to the one running below.
 
 Type in the input field.
 Remove the text from the input field.
 Click the button.
 
 <iframe class="running-app-frame"
-        style="height:220px;width:530px;"
+        style="height:220px;width:550px;"
         src="examples/3-buttonbadge/piratebadge.html">
 </iframe>
 
 
 #### Problems?
 
 Check your code against the files in `3-buttonbadge`.
 
 * [piratebadge.html](https://github.com/dart-lang/one-hour-codelab/blob/master/web/3-buttonbadge/piratebadge.html)
 
@@ skipping 338 matching lines @@
      alt="Run button">
 in Dart Editor to run the app.
 
 Compare your app to the one running below.
 
 Type in the input field.
 Remove the text from the input field.
 Click the button.
 
 <iframe class="running-app-frame"
-        style="height:220px;width:530px;"
+        style="height:220px;width:550px;"
         src="examples/4-classbadge/piratebadge.html">
 </iframe>
 
 
 #### Problems?
 
 Check your code against the files in `4-classbadge`.
 
 * [piratebadge.html](https://github.com/dart-lang/one-hour-codelab/blob/master/web/4-classbadge/piratebadge.html)
 
@@ skipping 235 matching lines @@
 <img src="images/run.png" width="16" height="16"
      alt="Run button">
 in Dart Editor to run the app.
 
 Compare your app to the one running below.
 
 Click the button to put a name on the badge.
 Start the app again by duplicating this window.
 
 <iframe class="running-app-frame"
-        style="height:220px;width:530px;"
+        style="height:220px;width:550px;"
         src="examples/5-localbadge/piratebadge.html">
 </iframe>
 
 
 #### Problems?
 
 Check your code against the files in `5-localbadge`.
 
 * [piratebadge.html](https://github.com/dart-lang/one-hour-codelab/blob/master/web/5-localbadge/piratebadge.html)
 
@@ skipping 332 matching lines @@
      alt="Run button">
 in Dart Editor to run the app.
 
 If you want to see what happens when the app can't find the `.json` file,
 change the file name in the code and run the program again.
 
 Compare your app to the final version running below.
 
 
 <iframe class="running-app-frame"
-        style="height:220px;width:530px;"
+        style="height:220px;width:550px;"
         src="examples/6-piratebadge_json/piratebadge.html">
 </iframe>
 
 
 #### Problems?
 
 Check your code against the files in `6-piratebadge_json`.
 
 * [piratebadge.html](https://github.com/dart-lang/one-hour-codelab/blob/master/web/6-piratebadge_json/piratebadge.html)
 
@@ skipping 102 matching lines @@
 on our [Samples page](/samples/).
 </div>
 
 ### <i class="icon-anchor"> </i> Read the tutorials.
 
 <div class="trydart-step-details" markdown="1">
 Learn more about Dart from
 the [Dart tutorials](/docs/tutorials/).
 </div>