Add 'setup.py docs' alias.

Runns 'setup.py develop' and installs documentation dependencies.

CHANGES.txt

@@ -4,6 +4,9 @@
 Unreleased
 ----------
 
+- Added ``setup.py docs`` alias (runs ``setup.py develop`` and installs
+  documentation dependencies).
+
 - Added ``setup.py dev`` alias (runs ``setup.py develop`` and installs
   testing dependencies).
 

setup.cfg

@@ -10,3 +10,4 @@ cover-erase=1
 
 [aliases]
 dev = develop easy_install zodburi[testing]
+docs = develop easy_install zodburi[docs]

setup.py

@@ -20,6 +20,7 @@ except:
 requires = ['ZODB3']
 tests_require = requires + ['mock']
 testing_extras = tests_require + ['nose', 'coverage']
+docs_extras = tests_require + ['Sphinx']
 
 setup(name='zodburi',
       version='1.2dev',
@@ -51,5 +52,6 @@ setup(name='zodburi',
       """,
       extras_require = {
         'testing': testing_extras,
+        'docs': docs_extras,
       },
       )