Fix up tox.ini

- Don't test python 3.0
- Tox no longer supports python 2.4
- Add a dependency on nose
- Disable C extension testing for now

tox.ini

@@ -4,7 +4,12 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py24, py25, py26, py27, py30, py31, py32, py33, pypy, jython
+envlist = py25, py26, py27, py31, py32, py33, pypy, jython
 
 [testenv]
-commands = python setup.py test
+commands =
+    # TODO: Figure out C extensions
+    {envpython} setup.py --no_ext test
+
+deps =
+    nose