Merge pull request #451 from helgi/crypto

fix(requirements): latest crypography is out now with official fix

Author: helgi

rootfs/requirements.txt

@@ -15,4 +15,3 @@ pytz==2015.7
 PyYAML==3.11
 requests==2.9.1
 simpleflock==0.0.3
-git+https://github.com/pyca/cryptography.git@1.2.x#egg=cryptography