add setings for nginx flower

conf/nginx_vds.conf

@@ -2,6 +2,11 @@ upstream dokumentor-dev {
 	server localhost:32768;
 }
 
+map $http_upgrade $connection_upgrade {
+        default upgrade;
+        ''      close;
+}
+
 server {
     client_max_body_size 175M;
     listen 0.0.0.0:80;
@@ -13,6 +18,10 @@ server {
         proxy_set_header Host $http_host;
         proxy_set_header X-NginX-Proxy true;
 
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection $connection_upgrade;
+        proxy_http_version 1.1;
+
         proxy_pass http://dokumentor-dev/;
         proxy_redirect off;
     }