ignore vim temporary files
fix for 88.  when I refactored the policy_file stuff to be in the YAML, I put it in the apt_test.yml (now deleted for clarity) and forgot to put it in the real yml file.  this caused a problem when it tried to concat a str with None
Merge pull request #90 from kvick/issue_88

Issue 88.  This should re-enable amination on ubuntu