title: Activating a virtual env not working
body: <p>I created two virtualenv and I installed two different versions of django. Now I have a problem to activate the two environment, I do like this :</p>
  
  <pre><code>source Django1.6/bin/activate
  </code></pre>
  
  <p>Then I see that the environment was activated. Then I do :</p>
  
  <pre><code>pip install django # for test
  </code></pre>
  
  <p>and I get this message :</p>
  
  <pre><code>Requirement already satisfied (use --upgrade to upgrade): 
                                   django in /usr/local/lib/python2.7/dist-packages
  </code></pre>
  
  <p>This tell that the environment was not activated but it use the default one. Why I'm getting this?</p>