Patch prevents downloading non essential .inv files during the doc build
diff -ur six-1.5.2.orig/documentation/conf.py six-1.5.2/documentation/conf.py
--- a/documentation/conf.py	2013-09-15 21:52:34.000000000 +0800
+++ b/documentation/conf.py	2014-01-07 18:19:24.958916446 +0800
@@ -211,7 +211,3 @@
      [u"Benjamin Peterson"], 1)
 ]
 
-# -- Intersphinx ---------------------------------------------------------------
-
-intersphinx_mapping = {"py2" : ("https://docs.python.org/2/", None),
-                       "py3" : ("https://docs.python.org/3/", None)}