Fixing issue 568 (#574)

Increasing buffer sizes for applications like react/babel.

Working on default images was throwing intermitten NGing errors and
requried multiple refreshes

nginx/sites/default.conf

@@ -15,6 +15,8 @@ server {
         try_files $uri /index.php =404;
         fastcgi_pass php-upstream;
         fastcgi_index index.php;
+        fastcgi_buffers 16 16k; 
+        fastcgi_buffer_size 32k;
         fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
         include fastcgi_params;
     }