Merge pull request #1774 from lukapaunovic/patch-42

Update nginx.conf

install/ubuntu/15.04/nginx/nginx.conf

@@ -50,6 +50,7 @@ http {
 
     # Compression
     gzip                on;
+    gzip_vary           on;
     gzip_comp_level     9;
     gzip_min_length     512;
     gzip_buffers        8 64k;