Don't worry about that, we refer our LAMP Stack 7 as Dev because our stable LAMP Stack has PHP 5.5.
That wiki page points that there are some applications which can be configured either "development" or "production" mode. For instance, in Wordpress, Magento or Joomla you can choose between one of those modes in their installation process.
Bitnami LAMP Stack doesn't belong to this group.
Hope it helps! Don't hesitate to ask us if you have more questions.