added missing indent filter

--HG--
branch : trunk
diff --git a/jinja2/filters.py b/jinja2/filters.py
index 56a2e02..fd3d66f 100644
--- a/jinja2/filters.py
+++ b/jinja2/filters.py
@@ -588,6 +588,7 @@
     'length':               len,
     'reverse':              reversed,
     'center':               do_center,
+    'indent':               do_indent,
     'title':                do_title,
     'capitalize':           do_capitalize,
     'first':                do_first,