Fixed #13093 -- Updated some decorators and the decorator_from_middleware function to allow callable classes to be decorated. Thanks to Brian Neal for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12762 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/utils/views.py

@@ -8,3 +8,10 @@ xview_dec = decorator_from_middleware(XViewMiddleware)
 def xview(request):
     return HttpResponse()
 xview = xview_dec(xview)
+
+
+class ClassXView(object):
+    def __call__(self, request):
+        return HttpResponse()
+
+class_xview = xview_dec(ClassXView())