Escape markdown code in column tooltips.

This is needed to avoid issues when the code contains quotes.

app/Template/app/projects.php

@@ -22,7 +22,7 @@
 
                 <?= $this->a($this->e($project['name']), 'board', 'show', array('project_id' => $project['id'])) ?>
                 <?php if (! empty($project['description'])): ?>
-                    <span class="column-tooltip" title='<?= $this->markdown($project['description']) ?>'>
+                    <span class="column-tooltip" title='<?= $this->e($this->markdown($project['description'])) ?>'>
                         <i class="fa fa-info-circle"></i>
                     </span>
                 <?php endif ?>