This revision includes the following changes:

  [1] the Audio_Caching_Manager and Installer classes now cache the file format and MIME type for each audio file it scans
  [2] the Display_Manager class only includes minor experimental changes, and another image URL was added to the random image background generator
  [3] a .htaccess file was added to the "app" folder to create SEO-friendly redirects, but will likely be removed as the architecture of this plugin does not support handling SEO-friendly URLs with Apache