Bug 1357802 - Show task.extra in task inspector (#209)

* Bug 1357802 - Show task.extra in task inspector

Add fix for displaying "Extra" from task.extra in "Task Details" view

* Bug 1357802 - Add condition for no task.extra

Add condition to skip task.extra rendering when it is non-existent

* Bug 1357802 - Treat task.extra as an object

task.extra will be a plain object when not specified

src/lib/ui/taskinfo.jsx

@@ -216,6 +216,17 @@ const TaskInfo = React.createClass({
               </td>
             </tr>
 
+            {Object.keys(task.extra).length > 0 && ( 
+              <tr>
+                <td>Extra</td>
+                <td>
+                  <Code language="json">
+                    {JSON.stringify(task.extra, null, 2)}
+                  </Code>
+                </td>
+              </tr>
+            )}
+
             <tr>
               <td>Debug</td>
               <td>