Improve activity stream/notification for task update events and add new notification for swimlane change

app/Template/notification/task_move_swimlane.php

@@ -0,0 +1,19 @@
+<h2><?= $this->e($task['title']) ?> (#<?= $task['id'] ?>)</h2>
+
+<ul>
+    <li>
+        <?php if ($task['swimlane_id'] == 0): ?>
+            <?= t('The task have been moved to the first swimlane') ?>
+        <?php else: ?>
+            <?= t('The task have been moved to another swimlane:') ?>
+            <strong><?= $this->e($task['swimlane_name']) ?></strong>
+        <?php endif ?>
+    </li>
+    <li>
+        <?= t('Column on the board:') ?>
+        <strong><?= $this->e($task['column_title']) ?></strong>
+    </li>
+    <li><?= t('Task position:').' '.$this->e($task['position']) ?></li>
+</ul>
+
+<?= $this->render('notification/footer', array('task' => $task, 'application_url' => $application_url)) ?>