Fixed #16744 -- Class based view should have the view object in the context

Updated the most recent patch from @claudep to apply again and updated
the documentation location.

django/views/generic/base.py

@@ -18,6 +18,8 @@ class ContextMixin(object):
     """
 
     def get_context_data(self, **kwargs):
+        if 'view' not in kwargs:
+            kwargs['view'] = self
         return kwargs