Update version constraint on PyJWT

Critical vulnerability in PyJWT: https://auth0.com/blog/2015/03/31/critical-vulnerabilities-in-json-web-token-libraries/

requirements.txt

@@ -25,7 +25,7 @@ ecdsa==0.11 #apt: 0.10
 gunicorn
 gevent
 isodate==0.5.1 #apt: 0.4.6
-pyjwt==0.4.3
+pyjwt==1.0.1
 kombu==3.0.24 #apt: 3.0.7
 lxml==3.2.1 #apt: 3.3.3
 mimeparse==0.1.3 #apt: 0.1.4