Merge branch 'staging' into nightly

data/conf/nginx/templates/nginx.conf.j2

@@ -13,6 +13,7 @@ events {
 http {
     include /etc/nginx/mime.types;
     default_type  application/octet-stream;
+    server_tokens off;
 
     log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                       '$status $body_bytes_sent "$http_referer" '

data/conf/nginx/templates/sites-default.conf.j2

@@ -14,7 +14,6 @@ ssl_session_tickets off;
 
 add_header Strict-Transport-Security "max-age=15768000;";
 add_header X-Content-Type-Options nosniff;
-add_header X-XSS-Protection "1; mode=block";
 add_header X-Robots-Tag none;
 add_header X-Download-Options noopen;
 add_header X-Frame-Options "SAMEORIGIN" always;