Add 'setup.py docs' alias:

- Installs 'Sphinx' and 'repoze.sphinx.autointerface'.

CHANGES.txt

@@ -4,6 +4,9 @@
 4.0 (unreleased)
 -----------------
 
+- Added ``setup.py docs`` alias (installs ``Sphinx`` and
+  ``repoze.sphinx.autointerface``).
+
 - Added ``setup.py dev`` alias (installs ``nose`` and ``coverage``).
 
 - Dropped dependency on ``zope.testing`` / ``zope.testrunner``:  tests now

setup.cfg

@@ -8,4 +8,4 @@ ignore-files=wref.py
 
 [aliases]
 dev = develop easy_install persistent[testing]
-
+docs = develop easy_install persistent[docs]

setup.py

@@ -81,6 +81,7 @@ setup(name='persistent',
       extras_require = {
         'test': TESTS_REQUIRE,
         'testing': TESTS_REQUIRE + ['nose', 'coverage'],
+        'docs': ['Sphinx', 'repoze.sphinx.autointerface'],
       },
       test_suite="persistent.tests",
       install_requires=[