[1.0.X] Fixed #10539 -- Updated Sphinx configuration to accommodate 0.6 while...

[1.0.X] Fixed #10539 -- Updated Sphinx configuration to accommodate 0.6 while retaining compatibility with 0.4 and 0.5. Thanks to Ramiro Morales for the patch.

Merge of r11162 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.0.X@11165 bcc190cf-cafb-0310-a4f2-bffc1f526a37