title: git-tfs clone fails with error code 128
body: <p>I'm using git-tfs to clone a TFS repository, something I've been able to do successfully in the past.  But with the current version when I run the command, like this...</p>
  
  <p><code>git tfs clone http://NameOfOurTfsServer:8080/ $/NameOfMyProject -d</code></p>
  
  <p>...I get an error code 128, e.g.:</p>
  
  <blockquote>
    <p><code>System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---&gt; Sep.Git.Tfs.Core.GitCommandException: Command exited with error code: 128
       at Sep.Git.Tfs.Core.GitHelpers.Close(Process process) in c:\Users\matt\dev\github\git-tfs\GitTfs\Core\GitHelpers.cs:line 205
       at Sep.Git.Tfs.Core.GitHelpers.&lt;&gt;c__DisplayClass8.&lt;CommandOutputPipe&gt;b__7() in c:\Users\matt\dev\github\git-tfs\GitTfs\Core\GitHelpers.cs:line 59 [etc.]</code></p>
  </blockquote>
  
  <p>This is on git-tfs 14.0.  I've tried several previous versions of git-tfs, but I get the same or similar errors on each one.</p>
  
  <p>Has anyone run into this?  Do you know a fix?</p>