scrot detection fix did not work on some systems (debian wheezy), this should make it work everywhere
scrot detection fix did not work on some systems (debian wheezy), this
should make it work everywhere

>>> subprocess.Popen(['which','scrot'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True).wait()
255
>>> subprocess.Popen(['which','scrot'], stdout=subprocess.PIPE, stderr=subprocess.PIPE).wait()
0

asweigart/pyautogui