Merge pull request #21 from navytux/parse_qsl

Fix PendingDeprecationWarning about cgi.parse_qsl

zodburi/_compat.py

 try:
     from urllib.parse import parse_qsl
 except ImportError: #pragma NO COVER
-    from cgi import parse_qsl
+    from urlparse import parse_qsl
 
 try:
     from urllib.parse import quote