title: Add method imports to shell_plus
body: <p>In <code>shell_plus</code>, is there a way to automatically import selected helper methods, like the models are? </p>
  
  <p>I often open the shell to type:</p>
  
  <pre><code>proj = Project.objects.get(project_id="asdf")
  </code></pre>
  
  <p>I want to replace that with: </p>
  
  <pre><code>proj = getproj("asdf")
  </code></pre>