Only convert DSN to string in Python 2.x (fixes GH-674)
Only convert DSN to string in Python 2.x (fixes GH-674)

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