Update tox.ini with py32/du08 envs.

tox.ini

@@ -1,8 +1,9 @@
 [tox]
-envlist=py24,py25,py26,py27,py31,pypy,du07,du06,du05
+envlist=py24,py25,py26,py27,py31,py32,pypy,du08,du07,du06,du05
 
 [testenv]
-deps=nose
+deps=
+    nose
 commands=
     nosetests
     sphinx-build -W -b html -d {envtmpdir}/doctrees doc {envtmpdir}/html
@@ -12,14 +13,6 @@ deps=
     nose
     simplejson
 
-[testenv:py25]
-deps=
-    nose
-    simplejson
-
-[testenv:py31]
-deps=https://bitbucket.org/jpellerin/nose3/get/tip.zip
-
 [testenv:pypy]
 deps=
     nose
@@ -39,3 +32,8 @@ deps=
 deps=
     nose
     docutils==0.7
+
+[testenv:du08]
+deps=
+    nose
+    docutils==0.8.1