created common nav bar in footer, changed send feedback link

src/site/_includes/tutorial.html

Index: src/site/_includes/tutorial.html
diff --git a/src/site/_includes/tutorial.html b/src/site/_includes/tutorial.html
index 5bb64d838ef9893004decc76b98fdb3638a47f15..2bbac344d7622cc9738601e98eacb3909b597089 100644
--- a/src/site/_includes/tutorial.html
+++ b/src/site/_includes/tutorial.html
@@ -48,14 +48,12 @@
              <a href="/docs/tutorials/indexeddb/">11: Use IndexedDB</a>
           </li>
         </ul>
-      </div>
+      </div> <!-- end tutorial-toc -->
 
       <div id="whats-the-point">
         <h4 id="page-highlights">What's the point?</h4>
-
         {{ whats_the_point | markdownify }}
-
-      </div>
+      </div> <!-- end whats-the-point -->
 
       <div id="code-links">
         <h4 id="examples">Examples</h4>
@@ -66,19 +64,42 @@
            <img src="https://drone.io/github.com/dart-lang/dart-tutorials-samples/status.png"
                 alt="Build Status" style="margin-top:10px;max-width:100%;">
         </a>
+      </div> <!-- end code-links -->
 
-
-      </div>
+    </div> <!-- end tutorial-side -->
       
-    </div>
     <div>&nbsp;</div>
 
-  </div>
+  </div> <!-- end div span3 -->
 
   <article class="span9 tutorial-content">
 
     {{ content | markdownify }}
 
+    <div class="row">
+      <div class="span3">
+      </div>
+      <div class="span9">
+        <hr>
+          <div class="row">
+            <div class="span3">
+              <a href="/docs/tutorials/{{page.prev}}"><i class="icon-chevron-left"> </i>&nbsp;{{page.prev-title}}</a>
+            </div>
+            <div class="span3">
+              <a href="https://code.google.com/p/dart/issues/entry?template=Documentation%20issue/feedback"
+                 target="_blank">
+              <i class="icon-comment"> </i>
+              Send feedback
+              </a>
+            </div>
+            <div class="span3">
+              <a href="/docs/tutorials/{{page.next}}" class="pull-right">{{page.next-title}}&nbsp;<i class="icon-chevron-right"> </i> </a>
+            </div>
+          </div> <!-- row -->
+        <!-- hr -->
+      </div> <!-- span9 -->
+    </div> <!-- row -->
+
   </article>
 
-</div>
+</div>