Render response headers

Fixes #930

src/main/template/operation.handlebars

@@ -74,10 +74,11 @@
               <th>HTTP Status Code</th>
               <th>Reason</th>
               <th>Response Model</th>
+              <th>Headers</th>
             </tr>
             </thead>
             <tbody class="operation-status">
-            
+
             </tbody>
           </table>
           {{/if}}

src/main/template/status_code.handlebars

@@ -1,3 +1,16 @@
 <td width='15%' class='code'>{{code}}</td>
 <td>{{{message}}}</td>
-<td width='50%'><span class="model-signature" /></td>
+<td width='50%'><span class="model-signature" /></td>
+<td class="headers">
+  <table>
+    <tbody>
+      {{#each headers}}
+      <tr>
+        <td>{{@key}}</td>
+        <td>{{this.description}}</td>
+        <td>{{this.type}}</td>
+      </tr>
+      {{/each}}
+    </tbody>
+  </table>
+</td>