Added initial rtorrent downloader, currently testing, possibly has some bugs.
Updated rtorrent-python library.
Added missing 'folder' parameter on the rtorrent downloader to fix moving/linking issues.
Added support for labels on the rtorrent downloader.
Cleaned up imports and added support for downloading magnet torrents via sources.
Updated rTorrent downloader to set ratio stop action, added new seeding methods and updated the rTorrent library