A simple rtorrent command line interface.
Add aliases.zsh to your .zshrc to use exec and cd.
You need to set scgi_port = localhost:5000 in your .rtorrent.rc
so that rtorrent-rpc can connect to rtorrent.
Other ports and hosts can be used by setting environment variables
RT_HOST and RT_PORT, but exec and cd won't work nicely unless
rtorrent is running on localhost.