title: Issue with VisualSVN
body: <p>I use VisualSVN Server 2.6 which uses svn version 1.8. I have TortoiseSVN client 1.7. 
  When I do a <code>svn info</code>, it throws the below error:</p>
  
  <pre><code>svn: E155036: Please see the 'svn upgrade' command
  svn: E155036: The working copy at 'F:\XMS\xmsWorkspace\1.0.00'
  is too old (format 29) to work with client version '1.8.0 (r1490375)' (expects f
  ormat 31). You need to upgrade the working copy first.
  </code></pre>
  
  <p>Can you please let me know, if VisualSVN Server is backward compatible?</p>