Order tags by slug

This adds an orderBy clause to findAllTags(). This makes the list of
tags more useful, as the tags appear in alphanumerical order instead of
somehow random.

Signed-off-by: Jan Losinski <losinski@wh2.tu-dresden.de>

src/Wallabag/CoreBundle/Repository/TagRepository.php

@@ -49,6 +49,7 @@ class TagRepository extends EntityRepository
             ->leftJoin('t.entries', 'e')
             ->where('e.user = :userId')->setParameter('userId', $userId)
             ->groupBy('t.id')
+            ->orderBy('t.slug')
             ->getQuery()
             ->getArrayResult();