Use rshift for switching layouts.

Fixes non-available alt+SMTH combinations.
Updated readme.
xmobarrc. Tweaks for desktop:

  * Added widgets for weather, volume & mpd.
  * Changed color of widget name for volume, weather & mpd.
  * Changed eth0 -> enp3s0.
Updated tmux-dashboard for desktop:

 * renamed window mplayer -> media.
 * show log of Xorg instead of daemon.
XMonad.hs: add mpv to list of floating clients.
Added config for rtorrent + hotkeys in xmonad.
Fixed issue with gpg-agent's envs in tmux.
Xinitrc: start leechcraft.
Switch to chromium as default browser
Add simple commands for converting audio files.