made contrib.pbkdf2 optionional for utils

VERSION

@@ -1 +1 @@
-Version 2.0.9 (2012-09-30 13:40:33) dev
+Version 2.0.9 (2012-09-30 13:47:42) dev

gluon/utils.py

@@ -21,7 +21,11 @@ import os
 import re
 import logging
 import socket
-from contrib.pbkdf2 import pbkdf2_hex
+try:
+    from contrib.pbkdf2 import pbkdf2_hex
+    HAVE_PBKDF2 = True
+except ImportError:
+    HAVE_PBKDF2 = False
 
 logger = logging.getLogger("web2py")