xmobarrc: added widgets weather, volume & mpd
xmobarrc: changed color of widget name for volume, weather & mpd
xinitrc: Run leechcraft at startup
Xmonad.hs, Xresources: added ncmpc hotkey + xresource entry
Updated readme
Actually use powerline in tmux
Use mod1 as mod key in xmonad.

Because steelseries 7g has bad position of mod4 key.
Revert "Use mod1 as mod key in xmonad."

This reverts commit 503ab861585dd6a390c98ffa0a8cd5e3a0106eb0.