activity: Initially sort rows by time of last activity

Doing this on the server is somewhat easier than making sorttable do it on page load.

(imported from commit 3ed7b127ba874d674d5cfe5b102c62a74be572f8)

templates/zephyr/activity.html

@@ -21,7 +21,7 @@
     </tr>
     </thead>
     <tbody>
-    {% for email, row in activity.rows.iteritems %}
+    {% for email, row in activity.sorted_rows %}
         <tr class="{{ row.class }}">
         <td><strong>{{ email }}</strong></td>
         <td sorttable_customkey="{{ row.get_updates_last|date:'YmdHi' }}">{{ row.get_updates_last }}</td>

zephyr/views.py

@@ -990,6 +990,10 @@ class ActivityTable(object):
                 row['class'] = 'recently_active'
             elif age >= datetime.timedelta(days=1):
                 row['class'] = 'long_inactive'
+            row['age'] = age
+
+    def sorted_rows(self):
+        return sorted(self.rows.iteritems(), key=lambda (k,r): r['age'])
 
 @login_required(login_url = settings.HOME_NOT_LOGGED_IN)
 def get_activity(request):