add nginx-proxy.conf for couchdb

[Camelliw]

[chendelin1982]

This can display interface, but is always loading

  location / {
        proxy_pass       $forward_scheme://$server:$port/_utils/;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
  }

[chendelin1982]

I think it need not modify / to /utils, becasue / is api uri