fixed issue 1117, snitize of unicode, thanks Bill

VERSION

@@ -1 +1 @@
-Version 2.2.1 (2012-10-31 09:52:38) stable
+Version 2.2.1 (2012-10-31 10:02:04) stable

gluon/sanitizer.py

@@ -220,7 +220,7 @@ def sanitize(text, permitted_tags=[
         'td': ['colspan'],
     },
         escape=True):
-    if not isinstance(text, str):
+    if not isinstance(text, basestring):
         return str(text)
     return XssCleaner(permitted_tags=permitted_tags,
                       allowed_attributes=allowed_attributes).strip(text, escape)