Various cleanups and added custom cycler.

--HG--
branch : trunk
diff --git a/jinja2/defaults.py b/jinja2/defaults.py
index 1d3be69..61706ae 100644
--- a/jinja2/defaults.py
+++ b/jinja2/defaults.py
@@ -8,7 +8,7 @@
     :copyright: 2007-2008 by Armin Ronacher.
     :license: BSD, see LICENSE for more details.
 """
-from jinja2.utils import generate_lorem_ipsum
+from jinja2.utils import generate_lorem_ipsum, Cycler
 
 
 # defaults for the parser / lexer
@@ -29,7 +29,8 @@
 DEFAULT_NAMESPACE = {
     'range':        xrange,
     'dict':         lambda **kw: kw,
-    'lipsum':       generate_lorem_ipsum
+    'lipsum':       generate_lorem_ipsum,
+    'cycler':       Cycler
 }