Remove use of check_output (not in Py2.6)
Remove use of check_output (not in Py2.6)

danriti/raven-python,akalipetis/raven-python,johansteffner/raven-python,getsentry/raven-python,ewdurbin/raven-python,danriti/raven-python,johansteffner/raven-python,akalipetis/raven-python,getsentry/raven-python,ewdurbin/raven-python,getsentry/raven-python,johansteffner/raven-python,danriti/raven-python,ewdurbin/raven-python,akalipetis/raven-python