Added dart:js samples landing pages.

src/site/samples/jsonp/index.markdown

Index: src/site/samples/jsonp/index.markdown
diff --git a/src/site/samples/jsonp/index.markdown b/src/site/samples/jsonp/index.markdown
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index 0000000000000000000000000000000000000000..250f32847da8e4393316072737ad048678a97c5f
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@@ -0,0 +1,23 @@
+---
+layout: default
+title: Fetching data using JSONP

[Kathy Walrath, 2013/11/06 17:48:26]

I thought we were using title case for titles?

+live_example_url: example/index.html
+
+header:
+  css: ["/samples/samples.css"]
+---
+
+## {{ page.title }}
+
+This sample uses `JSONP` and the `dart:js` library to retrieve data about
+Github repos belonging to the user, dart-lang.

[Kathy Walrath, 2013/11/06 17:48:26]

Github -> GitHub

user, dart-lang -> user dart-lang

+
+Read the
+[source](https://code.google.com/p/dart/source/browse/#svn%2Fbranches%2Fbleeding_edge%2Fdart%2Fsamples%2Fjsonp);

[Kathy Walrath, 2013/11/06 17:48:26]

; -> .

+
+<iframe class="running-app-frame"
+        style="height:500px;width:100%;"
+        src="{{page.live_example_url}}">
+</iframe>
+
+See all [samples](/samples/)

[Kathy Walrath, 2013/11/06 17:48:26]

. afterward?

(I don't think we're consistent about . vs. no .)

Actually, I'd be inclined to just have no period and full-line links. Like this:

[Read the source](...)
...
[See all samples](...)