Fixed #17228 -- params context variable is inconsistent

Remove the params variable from the context and just put the variables
in directly.

This had not been committed previously as the original pattern was used
in the functional generic views and we wanted consistency between them,
but django.views.generic.simple.direct_to_template is now gone so we can
do it 'right'.

docs/releases/1.5.txt

@@ -144,6 +144,14 @@ year|date:"Y" }}``.
 ``next_year`` and ``previous_year`` were also added in the context. They are
 calculated according to ``allow_empty`` and ``allow_future``.
 
+Context in TemplateView
+~~~~~~~~~~~~~~~~~~~~~~~
+
+For consistency with the design of the other generic views,
+:class:`~django.views.generic.base.TemplateView` no longer passes a ``params``
+dictionary into the context, instead passing the variables from the URLconf
+directly into the context.
+
 OPTIONS, PUT and DELETE requests in the test client
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~