title: Can't disable the autoescape in jinja2
body: <p>In GAE I use jinja2 with the autoescape, and everything works well.</p>
  
  <pre><code>import jinja2
  jinja_env = jinja2.Environment(loader = jinja2.FileSystemLoader(template_dir), autoescape = True)
  </code></pre>
  
  <p>In one template I don't want the autoescape, so I tried to disable it like this:</p>
  
  <pre><code>{% autoescape false %}
  {{content}}
  {% endautoescape %}
  </code></pre>
  
  <p>When it's time to render this template I get the message <code>Encountered unknown tag 'autoescape'.</code></p>