title: Create virtualenv in existing directory without creating a "local" directory
body: <p>I'm trying something simple.  I clone a repository and then I want to create a virtualenv in it:</p>
  
  <pre><code>hg clone ssh://hg@bitbucket.org/neves/repo site
  virtualenv site
  </code></pre>
  
  <p>When I run the command to create a Python virtualenv in an exiting project, a directory named <em>local</em> is created.  All the contents of the "site" dir are copied to this local dir. I don't want this behaviour.  Am I doing something wrong? How do I create a virtualenv without creating this <em>local</em> dir?</p>
  
  <p>I'm using virtualenv 1.10.1</p>