Add a new jsonprint filter, used in metrics, query

puppetboard/templates/metric.html

@@ -11,7 +11,11 @@
     {% for key,value in metric %}
     <tr>
       <td>{{key}}</td>
-      <td>{{value}}</td>
+      {% if value is mapping %}
+        <td><pre>{{value|jsonprint}}</pre></td>
+      {% else %}
+        <td>{{value}}</td>
+      {% endif %}
     </tr>
     {% endfor %}
   </tbody>

puppetboard/templates/query.html

@@ -53,7 +53,7 @@
   <div class="row">
     <div class="span12">
       <h2>Result</h2>
-      <pre><code>{{ result|tojson|replace(", ", ",\n") }}</code></pre>
+      <pre><code>{{result|jsonprint}}</code></pre>
     </div>
   </div>
   {% endif %}