#447: Dockerfile, add trivial reference to install centos7
#447: Dockerfile, add trivial reference to install centos7

Johns2MW/drupal-demonstration,jeff1evesque/drupal-demonstration,jeff1evesque/drupal-demonstration,jeff1evesque/drupal-demonstration,Johns2MW/drupal-demonstration,Johns2MW/drupal-demonstration,Johns2MW/drupal-demonstration,jeff1evesque/drupal-demonstration,Johns2MW/drupal-demonstration,Johns2MW/drupal-demonstration,jeff1evesque/drupal-demonstration,jeff1evesque/drupal-demonstration