title: git-svn dcommit fails because the repository name contains a space
body: <p>When attemping to <code>git svn dcommit</code> to a repository that has spaces in it's name, I get the following error:</p>
  
  <pre><code>Committing to http://svn.kuluvalley.com/Meet the Expert/trunk ...
  http://svn.kuluvalley.com/Meet the Expert/trunk
  Filesystem has no item: '/!svn/bc/7397/Meet' path not found at /usr/libexec/git-core/git svn line 592
  </code></pre>
  
  <p>It looks like <code>git svn</code> doesn't support directories with spaces in them.</p>