move util/xml.py and update reference from config.py
diff --git a/xos/xos/config.py b/xos/xos/config.py
index 7a64de9..50b04d0 100644
--- a/xos/xos/config.py
+++ b/xos/xos/config.py
@@ -6,7 +6,7 @@
 import tempfile
 import codecs
 from StringIO import StringIO
-from util.xml import Xml
+from xml_util import Xml
 
 default_config = \
 """
diff --git a/xos/util/xml.py b/xos/xos/xml_util.py
similarity index 100%
rename from xos/util/xml.py
rename to xos/xos/xml_util.py