updated readme with an example on how to customise the PaperclipTorrent::TorrentFile attachment field
attachment name now saving on PaperclipTorrent::TorrentFileAttachment class to allow multiple attachment types to be used as torrents
torrent_results now auto loads the PaperclipTorrent::TorrentFileAttachment reference
can update a torrent file in place - current_save_path will need to be writable for this to work