xinitrc: don't start trayer

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
xmonad: call `configure-session` via startupHook

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>
Merge remote-tracking branch 'origin/master'

Signed-off-by: Niklas Koep <niklas.koep@gmail.com>

Conflicts:
	xmonad/.xmonad/xmonad.hs