• Add Facets to the OPDS catalog (check config item cops_books_filter).
  So far the only OPDS client that support facets are Mantano Reader and Bluefire
• Fix book sort in some list. Patch provided by Tyler J. Wagner.
• Update .htaccess to check if Xsendfile is available. Thanks to Gaspine for the patch.
• Add basic support of custom columns. Check the following config item : cops_calibre_custom_column
• Usage of X-Accel-Redirect / X-Sendfile is not necessary anymore. Warning all Nginx users
  who wants to still use X-Accel-Redirect must add
  $config['cops_x_accel_redirect'] = "X-Accel-Redirect" in their config_local.php
• Fix COPS on IIS / Windows. Reported by Kevnancy.
• Simplified config_default.php
• Add a new config_local.php.example with the minimal configuration item to change.