title: Exclude a config file from the merge process
body: <p>Is there a way to exclude a specified file from the merge process? when merging from our production branch to the test branch for the testers to use, we want to exclude a config file which contains the SQL connection string. Preventing the need to edit it post merge. I did see a comment about using the cloak option but i can only see this available for folders not files.</p>
  
  <p>Tim</p>