New features: endedplayback, altspeed, action delay

Altspeed: https://github.com/correl/Transmission-XBMC/pull/22

Ended Playback: the addon only detected when used stopped the video
player and not when the video ended. Now it can detect when playback
ended.

Added a delay so if user finishes to watch a video and started a new
video a few seconds later the addon would start all torrents then
immediately stopped again. Now user can select between 1-60 seconds
until execute the action.