Added a sphinx build to the tox configuration, and fixed a warning in the docs…

Added a sphinx build to the tox configuration, and fixed a warning in the docs (thanks to Justin Lilly for the assist).

docs/external_apps.txt

@@ -12,13 +12,15 @@ of interest.
 
 
 
 
 If you have an application that you'd like to see listed here, simply fork
 If you have an application that you'd like to see listed here, simply fork
-``taggit`` on `github <http://github.com/alex/django-taggit>`_, add it to this
-list, and send a pull request.
+``taggit`` on `github`__, add it to this list, and send a pull request.
 
 
  * ``django-taggit-suggest``: Provides support for defining keyword and regular
  * ``django-taggit-suggest``: Provides support for defining keyword and regular
    expression rules for suggesting new tags for content.  This used to be
    expression rules for suggesting new tags for content.  This used to be
-   available at ``taggit.contrib.suggest``.  Available on
-   `github <http://github.com/frankwiles/django-taggit-suggest>`_.
+   available at ``taggit.contrib.suggest``.  Available on `github`__.
  * ``django-taggit-templatetags``: Provides several templatetags, including one
  * ``django-taggit-templatetags``: Provides several templatetags, including one
    for tag clouds, to expose various ``taggit`` APIs directly to templates.
    for tag clouds, to expose various ``taggit`` APIs directly to templates.
-   Available on `github <http://github.com/feuervogel/django-taggit-templatetags>`_.
+   Available on `github`__.
+
+__ http://github.com/alex/django-taggit
+__ http://github.com/frankwiles/django-taggit-suggest
+__ http://github.com/feuervogel/django-taggit-templatetags

tox.ini

 [tox]
 [tox]
-envlist = py25, py26 , py27, pypy, py25-trunk, py26-trunk, py27-trunk, pypy-trunk
+envlist =
+    py25, py26 , py27, pypy, py25-trunk, py26-trunk, py27-trunk, pypy-trunk, docs
 [testenv]
 [testenv]
-commands = python setup.py test
+commands =
+    python setup.py test
 deps =
 deps =
     django==1.2.3
     django==1.2.3
 
 
@@ -27,3 +29,10 @@ deps =
 basepython = pypy
 basepython = pypy
 deps =
 deps =
     http://www.djangoproject.com/download/1.3-alpha-1/tarball/
     http://www.djangoproject.com/download/1.3-alpha-1/tarball/
+
+[testenv:docs]
+changedir = docs
+deps =
+    sphinx
+commands =
+    sphinx-build -W -b html -d {envtmpdir}/doctrees . {envtmpdir}/html