Docs: include virtualenv intershphinx for proper directive links

See http://www.sphinx-doc.org/en/stable/domains.html#directive-option

docs/conf.py

@@ -298,6 +298,7 @@
                'https://docs.djangoproject.com/en/%s/_objects' % django_ver),
     'toolkit': ('http://docs.translatehouse.org/projects/translate-toolkit/en/latest/', None),
     'tastypie': ('https://django-tastypie.readthedocs.org/en/latest/', None),
+    'virtualenv': ('https://virtualenv.readthedocs.org/en/latest/', None),
 }
 
 

docs/developers/hacking.rst

@@ -90,7 +90,7 @@ available, we can start creating our virtual environment.
 Replace ``<env-name>`` with a meaningful name that describes the environment
 you are creating. :command:`mkvirtualenv` accepts any options that
 :command:`virtualenv` accepts. We could for example specify to use the Python
-2.6 interpreter by passing the :option:`-p python2.6` option.
+2.6 interpreter by passing the :option:`-p python2.6 <virtualenv:-p>` option.
 
 .. note:: After running :command:`mkvirtualenv`, the newly created environment
    is activated. To deactivate it just run:

requirements/build.txt

@@ -1,3 +1,3 @@
 -r base.txt
 
-sphinx<1.3.4
+sphinx

tox.ini

@@ -58,7 +58,7 @@ commands=
 basepython=python
 skipsdist=True
 deps=
-    sphinx<1.3.3
+    sphinx
     .
 whitelist_externals=
     make