Include mention of jenkins as an example framework for doing CI

Doc/library/unittest.rst

@@ -99,9 +99,10 @@ need to derive from a specific class.
 
    The script :file:`Tools/unittestgui/unittestgui.py` in the Python source distribution is
    a GUI tool for test discovery and execution.  This is intended largely for ease of use
-   for those new to unit testing.  For production environments it is recommended that
-   tests be driven by a continuous integration system such as `Hudson <http://hudson-ci.org/>`_
-   or `Buildbot <http://buildbot.net/trac>`_.
+   for those new to unit testing.  For production environments it is
+   recommended that tests be driven by a continuous integration system such as
+   `Buildbot <http://buildbot.net/trac>`_, `Jenkins <http://jenkins-ci.org>`_
+   or  `Hudson <http://hudson-ci.org/>`_.
 
 
 .. _unittest-minimal-example: