This revision introduces the following changes:

  [1] The main app/index.php file now includes a listing of cached files from the database
  [2] The icons.png sprite now includes a small arrow for use on the mobile version of the site, which will be displayed on the right-center side of each archive item
  [3] main.css includes new styles for the mobile arrow mentioned above, as well as fixing a few naming conventions when the "stream" and "download" button positions were swapped in app/index.php
  [4] The Display_Manager class includes several methods and instance variables which enabled the class to fetch and generate dynamic HTML to display each archive item by month