Added download directory and sub-path support for uTorrent

The previous solution ( https://github.com/RuudBurger/CouchPotatoServer/commit/b7d93b84dd74cdbee01543be17053841de740455 ) didn't properly work with Windows, we had a small discussion here: https://github.com/mikke89/CouchPotatoServer/commit/1be8d5bc84328bb8c46477fd3ba6feaa38dc53a9

I've tested this solution on both Windows and Linux, and it works as expected. This does require that the user define the download folders, either in the uTorrent GUI, or in the config file for the uTorrent server version on Linux (with the config option "download_dir").

I'm not sure what's up with all these commits, I'm pretty new at Git, sorry about that ;) Anyway, the files changed should be more reasonable.