Added landing pages for new samples

src/site/samples/terminal/index.markdown

 ---
 layout: default

[Kathy Walrath, 2013/10/23 18:47:40]

It seems like it should be either "the File System" or "FileSystem", not "the
Filesystem".

("filesystem" is not unknown, but it's usually two words, according to google.
Also, the camel case API name indicates that it's being treated as two words,
not one.)

-title: Emulating a terminal for working with the filesystem
+title: Emulating a Terminal for Working with the Filesystem
 live_example_url: example/index.html
 
 header:
   css: ["/samples/samples.css"]
 ---
 
 ## {{ page.title }}
 
 This sample ports the example used in
 [this HTML5Rocks
 article](http://www.html5rocks.com/en/tutorials/file/filesystem/#toc-samples-terminal)
 by Eric Bidelman about using the FileSystem APIs.
 
 This app replicates common UNIX filesystem operations such as cd, mkdir,
 rm, open, and cat using the FileSystem API.
 
 Read the
 [source](https://github.com/dart-lang/dart-samples/tree/master/web/html5/file/terminal).
 
 <iframe class="running-app-frame"
         style="height:500px;width:100%;"
         src="{{page.live_example_url}}">
 </iframe>
 
-See all [samples](/samples/)
+See all [samples](/samples/).