Add option to download as reST

IPython/html/static/notebook/js/menubar.js

@@ -133,7 +133,11 b' var IPython = (function (IPython) {'
         this.element.find('#download_html').click(function () {
             that._nbconvert('html', true);
         });
-        
+
+        this.element.find('#download_rst').click(function () {
+            that._nbconvert('rst', true);
+        });
+
         this.element.find('#rename_notebook').click(function () {
             IPython.save_widget.rename_notebook();
         });

IPython/html/templates/notebook.html

@@ -83,6 +83,7 b' class="notebook_app"'
                         <li id="download_ipynb"><a href="#">IPython Notebook (.ipynb)</a></li>
                         <li id="download_py"><a href="#">Python (.py)</a></li>
                         <li id="download_html"><a href="#">HTML (.html)</a></li>
+                        <li id="download_rst"><a href="#">reST (.rst)</a></li>
                     </ul>
                 </li>
                 <li class="divider"></li>