title: Scrapy shell does not have hxs or xxs as available objects
body: <p>First, I am following the tutorial from: <a href="http://doc.scrapy.org/en/0.16/intro/tutorial.html" rel="nofollow">http://doc.scrapy.org/en/0.16/intro/tutorial.html</a>.</p>
  
  <p>I run:</p>
  
  <pre><code>scrapy shell http://www.dmoz.org/Computers/Programming/Languages/Python/Books/
  </code></pre>
  
  <p>From the tutorial it says: "The shell also instantiates two selectors, one for HTML (in the hxs variable) and one for XML (in the xxs variable) with this response. So let’s try them:"</p>
  
  <p>My output however does not have hxs or xxs as available objects:</p>
  
  <pre><code>[s] Available Scrapy objects:
  [s]   crawler    &lt;scrapy.crawler.Crawler object at 0x03B33750&gt;
  [s]   item       {}
  [s]   request    &lt;GET http://tvtorrents.com/loggedin/show.do?id=3845&gt;
  [s]   response   &lt;200 http://tvtorrents.com/login.do&gt;
  [s]   settings   &lt;scrapy.settings.Settings object at 0x02718790&gt;
  [s]   spider     &lt;Spider 'default' at 0x3e30190&gt;
  [s] Useful shortcuts:
  [s]   shelp()           Shell help (print this help)
  [s]   fetch(req_or_url) Fetch request (or URL) and update local objects
  [s]   view(response)    View response in a browser
  </code></pre>
  
  <p>I am expecting:</p>
  
  <pre><code>[s]   hxs        &lt;HtmlXPathSelector (http://www.dmoz.org/Computers/Programming/Languages/Python/Books/) xpath=None&gt;
  [s]   xxs        &lt;XmlXPathSelector (http://www.dmoz.org/Computers/Programming/Languages/Python/Books/) xpath=None&gt;
  </code></pre>
  
  <p>as "available objects".</p>
  
  <p>This prevents me from refining the output like so:</p>
  
  <pre><code>In [1]: hxs.select('//title')
  Out[1]: [&lt;HtmlXPathSelector (title) xpath=//title&gt;]
  </code></pre>
  
  <p>Any help is appreciated!</p>