Drupal 7 port

Works
  * Add a image with rel="lightbox"
  * Add a image group with rel="lightbox[group]"
  * Slideshow using rel="lightshow[group]"
  * HTML content using rel="lightframe"
  * Modal with rel="lightmodal", and with settings, show a blank screen if
    the url address is invalid(404 error)
 
Integration with external modules
  * acidvideo - There is not a drupal 7 version

Not tested
  * Video using rel=lightshow

To do
  * Add a description in hook_permission
  * This is many filters without any action, look if this is really necessaary,
    if not, remove the ones without action

  