Added consistent support for double- and single-quote delimiters in templates.

Some template filters and tags understood single-quoted arguments, others
didn't. This makes everything consistent. Based on a patch from akaihola.

Fixed #7295.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10118 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/templates/tests.py

@@ -20,6 +20,7 @@ from django.utils.tzinfo import LocalTimezone
 
 from unicode import unicode_tests
 from context import context_tests
+from parser import filter_parsing, variable_parsing
 
 try:
     from loaders import *
@@ -31,7 +32,8 @@ import filters
 # Some other tests we would like to run
 __test__ = {
     'unicode': unicode_tests,
-    'context': context_tests
+    'context': context_tests,
+    'filter_parsing': filter_parsing,
 }
 
 #################################