title: Django, can't create app in subfolder
body: <p>I'm on windows and trying to create a new app inside a common folder named <em>Apps</em>.
  The <em>myApp</em> folder already exists inside <em>Apps</em>. I'm running from the project root:</p>
  
  <pre><code>python manage.py startapp myApp Apps\myApp
  </code></pre>
  
  <p>and I get:</p>
  
  <pre><code>Error: 'Apps\\myApp' is not a valid app name. Please use only numbers, letters and underscores.
  </code></pre>
  
  <p>I don't know why that double backslash.
  I tried also with a forward slash just to be sure:</p>
  
  <pre><code>python manage.py startapp myApp Apps/myApp
  </code></pre>
  
  <p>and I get this:</p>
  
  <pre><code>Error: 'myApp' conflicts with the name of an existing Python module and cannot be used as an app name. Please try another name.
  </code></pre>
  
  <p>I can't understand if it is a Windows or a Python problem.</p>