Added bash script that can be called by transmission when a torrent download finishes. Now it only removes the torrent from transmission's active torrents, in the future it should make downloaded video files available to XBMC (hopefully in the correct location for the show/season). Added a lot of documentation to README.md. Also added trnsm2script_vars.txt, a text file that lists the shell environment variables created by transmission, which can then be used by the bash script that is called when torrents finish downloading. Examples of values for these variables are also included.