Docserver: Update to the latest version of handlebar. Lots of re-syntaxifying.

chrome/common/extensions/docs/templates/private/sample_item.html

+{{#sample}}
 <div class="sample" tags="{{#api_calls}}chrome.{{name}} {{/}}">
   <img class="icon" src="{{icon}}">
   <h2 id="{{id}}"><a href="{{download_url}}">{{name}}</a></h2>
-  {{?description}}
-  {{description}}
-  {{/description}}
+  {{?description description/}}
   <div>
     <span class="label">Calls:</span>
     <ul>
-      {{#api_calls}}
-      <li><code><a href="{{link}}">{{name}}</a></code></li>
-      {{/}}
+      {{#call:api_calls}}
+      <li><code><a href="{{call.link}}">{{call.name}}</a></code></li>
+      {{/api_calls}}
     </ul>
   </div>
   <div>
     <span class="label">Source Files:</span>
     <ul>
-      {{#files}}
-      <li><code><a href="{{url}}/{{@}}">{{@}}</a></code></li>
-      {{/}}
+      {{#f:files}}
+      <li><code><a href="{{url}}/{{f}}">{{f}}</a></code></li>
+      {{/files}}
     </ul>
   </div>
 </div>
+{{/sample}}