Tidy up tests and circle config

circle.yml

   services:
     - docker
 
-dependencies:
-  pre:
-    - pip install nose pylint
-
 test:
-  override:
+  post:
     - pylint -d invalid-name docker-rerun
-    - nosetests test.py
 

requirements.txt

+nose
+pylint
+

test.py

 
 
     def test_command_matches(self):
-        """
-        Tests that the command used to start a docker container exactly matches
-        that returned by ./docker-rerun --dry-run.
-        """
         commands = [
             'docker run --name=test123 -d hello-world',
             'docker run --name=test123 --restart=always -d hello-world',
                 self.assertEqual(output[3], command)
                 self._run(['docker', 'rm', '-f', 'test123'])
 
-
-if __name__ == '__main__':
-    unittest.main()