title: django-tables2 doesn't sort
body: <p>can't get sorting working for a django-tables2 table. </p>
  
  <pre><code>class MyModel(models.Model):
      pid = models.AutoField('id',primary_key = True)
      name = models.CharField(max_length = 255,
                              help_text='The name')
  def show_mymodels(request):
      """ the view """
      table = MyModelTable(MyModel.objects.all())
      return render(request,'mymodel.html',{'table':table})
  
  class MyModelTable(tables.Table):
      class Meta:
          model = MyModel
          orderable = True
  </code></pre>
  
  <p>And mymodel.html looks as follows:</p>
  
  <pre><code>{% load render_table from django_tables2 %}
  {% render_table table %}
  </code></pre>
  
  <p>This renders the table correct but nothing happens when clicking the columns in the browser. Other then the urld change <code>http://127.0.0.1:8000/show_mymodel</code> --> <code>http://127.0.0.1:8000/show_mymodel?sort=name</code></p>
  
  <p>What is it that I'm doing wrong?</p>