'Returns the template context for a step. You can overwrite this method
to add more data for all or some steps. This method returns a
dictionary containing the rendered form step. Available template
context variables are:
* all extra data stored in the storage backend
* `form` - form instance of the current step
* `wizard` - the wizard instance itself
Example:
.. code-block:: python
class MyWizard(WizardView):
def get_context_data(self, form, **kwargs):
context = super(MyWizard, self).get_context_data(form=form, **kwargs)
if self.steps.current == \'my_step_name\':
context.update({\'another_var\': True})
return context'

def get_context_data(self, form, **kwargs):

    context = super(WizardView, self).get_context_data(form=form, **kwargs)
    context.update(self.storage.extra_data)
    context['wizard'] = {'form': form, 'steps': self.steps, 'management_form': ManagementForm(prefix=self.prefix, initial={'current_step': self.steps.current})}
    return context
