title: Git submodules are being -dirty?
body: <p>I just cloned a repository as a submodule into one of my projects. Al is well and working, but all of a sudden i get this message when I do <code>git status</code>;</p>
  
  <pre><code># Changes not staged for commit:
  #   (use "git add &lt;file&gt;..." to update what will be committed)
  #   (use "git checkout -- &lt;file&gt;..." to discard changes in working directory)
  #   (commit or discard the untracked or modified content in submodules)
  #
  #       modified:   wp-content/plugins/advanced-custom-fields (untracked content
  )
  #
  </code></pre>
  
  <p>And if I do <code>git diff</code> I get the following:</p>
  
  <pre><code>-Subproject commit 486e51db9b6ce49114c897ed1893a208d2289a29
  +Subproject commit 486e51db9b6ce49114c897ed1893a208d2289a29-dirty
  </code></pre>
  
  <p>What is worrying is the -dirty change. What does it mean? How do I fix it? I havent made any changes to the repository. But Dreamweaver may have added stupid _notes folders to it. I have tried to delete them but still have same problem. Is this what is causing it to be dirty?</p>
  
  <p>If I try and do a <code>git add -A</code> it still says I have untracked content.</p>
  
  <p>Any ideas?</p>