remove xvfb script

script/xvfb.sh

-#!/bin/bash
-
-[ "$(which Xvfb)" = "" ] && {
-	sudo apt-get -qq update
-	sudo apt-get -qqy install xvfb
-	echo 1>&2 "Install Xvfb done"
-}
-
-[ "$(pgrep -c Xvfb)" = 0 ] && {
-	Xvfb :99 -screen 0 640x480x8 > /dev/null 2>&1 &
-	echo 1>&2 "Start Xvfb done"
-}
-
-echo 1>&2 "Xvfb ready."
-echo 1>&2
-
-[ "$DISPLAY" = "" ] && {
-  echo "export DISPLAY=:99.0"
-  echo 1>&2
-}