Fixes #7817 and #9456.

- The include tag now has a 'with' option to include to provide extra context
  vairables to the included template.

- The include tag now has an 'only' option to exclude the current context
  when rendering the included template.

- The with tag now accepts multiple variable assignments.

- The with, include and blocktrans tags now use a new keyword argument format
  for variable assignments (e.g. `{% with foo=1 bar=2 %}`).

git-svn-id: http://code.djangoproject.com/svn/django/trunk@14922 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/topics/forms/index.txt

@@ -371,12 +371,11 @@ using the :ttag:`include` tag to reuse it in other templates::
     {% endfor %}
 
 If the form object passed to a template has a different name within the
-context, you can alias it using the :ttag:`with` tag::
+context, you can alias it using the ``with`` argument of the :ttag:`include`
+tag::
 
     <form action="/comments/add/" method="post">
-        {% with comment_form as form %}
-            {% include "form_snippet.html" %}
-        {% endwith %}
+        {% include "form_snippet.html" with form=comment_form %}
         <p><input type="submit" value="Submit comment" /></p>
     </form>