title: Jinja2 Environment option "lstrip_blocks" produces TypeError
body: <p>I am using Ubuntu 12.04, python 3.2.3 and jinja2 2.6-1.</p>
  
  <p>When passing the option <strong>lstrip_blocks</strong> to the Environment as follows, I get this error </p>
  
  <p><code>"**TypeError: \__init__() got an unexpected keyword argument 'lstrip_blocks'**"</code></p>
  
  <pre><code>from jinja2 import Environment, PackageLoader
  env = Environment(loader=PackageLoader('jinja2_hello','.'),lstrip_blocks=True)
  template = env.get_template('template_hello.html')
  output = template.render()
  print(output)
  </code></pre>
  
  <p>The template <code>template_hello.html</code> contains only:</p>
  
  <pre><code>hello
  </code></pre>
  
  <p>The other option '<em>trim_blocks</em>`, alone, works perfectly.</p>
  
  <p>Would you have any suggestions to solve this. I haven't been able to fix it. Thanks</p>