Prevent unwanted d'loading of un-needed objects.inv files
diff -ur logbook-0.4.2.orig/docs/conf.py logbook-0.4.2/docs/conf.py
--- logbook-0.4.2/docs/conf.py	2013-06-02 19:31:32.000000000 +0800
+++ logbook-0.4.2/docs/conf.py	2013-06-30 10:50:38.604402792 +0800
@@ -219,6 +219,3 @@
      [u'Armin Ronacher, Georg Brandl'], 1)
 ]
 
-intersphinx_mapping = {
-    'http://docs.python.org': None
-}
