title: Create View - access to success_url from templates
body: <p>say I have:</p>
  
  <pre><code>class MyCreate(CreateView):
      template_name = 'template.html'
      success_url = reverse_lazy('blabla')
      form_class = MyForm
  </code></pre>
  
  <p>And suppose in my template I want to add a <code>back</code> button. The back will lead me to the same page as <code>success_url</code>. My solution was to override <code>get_context_data</code> in <code>MyCreate</code> class and add <code>{'back': self.get_success_url()}</code> to the <code>context</code>.</p>
  
  <p>The implications is that I have more CreateViews and I had to create a <code>ContextMixin</code> for this <code>back</code> button. Is there any other easier solution? something like accessing <code>success_url</code> directly in my template?</p>
  
  <p>Thanks</p>