Add support for IPv6 (#76)

nginx.conf

@@ -14,7 +14,7 @@ http {
     map_hash_bucket_size 128;
     include       /etc/nginx/mime.types;
     default_type  application/octet-stream;
-    
+
     # Include nginx timeout configs
     include       /etc/nginx/nginx.timeouts.config.conf;
 
@@ -133,6 +133,7 @@ http {
     # The proxy director layer, listens on 3128
     server {
         listen 3128;
+        listen [::]:3128;
         server_name proxy_director_;
 
         # dont log the CONNECT proxy.