revamped jinja2 import system.  the behavior is less confusing now, but it's not backwards compatible.  I like it though ;)

--HG--
branch : trunk
diff --git a/jinja2/filters.py b/jinja2/filters.py
index 68f9b5f..801b350 100644
--- a/jinja2/filters.py
+++ b/jinja2/filters.py
@@ -633,5 +633,6 @@
     'round':                do_round,
     'sort':                 do_sort,
     'groupby':              do_groupby,
-    'safe':                 Markup
+    'safe':                 Markup,
+    'xmlattr':              do_xmlattr
 }