turn errors and access logs on by default for nginx

nginx/nginx.conf

@@ -17,8 +17,8 @@ http {
   types_hash_max_size 2048;
   include /etc/nginx/mime.types;
   default_type application/octet-stream;
-  access_log off;
-  error_log off;
+  access_log on;
+  error_log on;
   gzip on;
   gzip_disable "msie6";
   include /etc/nginx/conf.d/*.conf;