Check not dirty

Author: gatesn

circle.yml

@@ -2,6 +2,10 @@ machine:
   post:
     - pyenv global 2.7.11 3.4.3
 
+test:
+  post:
+    - ./setup.py -V | grep dirty -vq
+
 deployment:
   releases:
     tag: /[0-9]+(\.[0-9]+)+((-(beta|rc)[0-9]{1,2})(\.[0-9])?)?/