Merge branch 'update-ciphers-nginx' into 'master'

Update Ciphers Nginx

The current suggested Ciphers do not qualify anymore as completely safe, see for instance [here.](https://community.qualys.com/blogs/securitylabs/2013/03/19/rc4-in-tls-is-broken-now-what)

This updates the ciphers, following [Remy's advise](https://raymii.org/s/tutorials/Strong_SSL_Security_On_nginx.html).

Author: axilleas

web-server/nginx/gitlab-ssl

@@ -47,7 +47,7 @@ server {
     ssl_certificate /etc/nginx/gitlab.crt;
     ssl_certificate_key /etc/nginx/gitlab.key;
     ssl_protocols  SSLv3 TLSv1 TLSv1.2;
-    ssl_ciphers AES:HIGH:!ADH:!MD5;
+    ssl_ciphers 'ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!CAMELLIA:!DES:!MD5:!PSK:!RC4';
     ssl_prefer_server_ciphers   on;
 
     # individual nginx logs for this gitlab vhost