Show subscription detail in the log

[LadyMadonna]

In the event of TVShows downloading something random (because that something was included in a feed by mistake, here's an example), currently there's no way to tell which subscription it came from. The log details the show name, episode number and file URL (line "Episode downloaded successfully: ShowName SXXEXX fileURL"), but not the feed URL nor the subscription name, and the show name and episode number are extracted from the file URL.

This can be solved by including the feed URL in any of the log lines related to downloading an episode. For example: "Attempting to download new episode: ShowName SXXEXX feedURL".