Add backup to nginx config; fix another unit test.

tests/functional/C02_Station_MediaCest.php

@@ -49,6 +49,6 @@ class C02_Station_MediaCest extends CestAbstract
 
         $I->amOnPage('/station/'.$station_id.'/files');
 
-        $I->see('Media Manager');
+        $I->see('Music Files');
     }
 }

util/ansible/roles/nginx/tasks/main.yml

@@ -42,7 +42,7 @@
 
   - name: Add nginx global config
     become: true
-    template: src=nginx.conf.j2 dest=/etc/nginx/nginx.conf
+    template: src=nginx.conf.j2 dest=/etc/nginx/nginx.conf backup=yes
 
   - name: Add app-specific nginx site
     become: true