make it possible to run tox tests via tox without installing numpy, e…

…tc in virtualenv

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py26,py27,py32,py33,pypy
+envlist = py26,py27,py32,py33,pypy,py27-nodeps,py33-nodeps
 
 [testenv]
 
@@ -48,3 +48,22 @@ commands =
 
     ; python runtests.py --with-coverage --cover-inclusive --cover-package=nltk --cover-html --cover-html-dir={envdir}/docs []
     python runtests.py []
+
+
+[testenv:py27-nodeps]
+basepython = python2.7
+
+deps =
+    nose >= 1.2.1
+
+commands =
+    python runtests.py []
+
+[testenv:py33-nodeps]
+basepython = python3.3
+deps =
+    nose >= 1.2.1
+
+commands =
+    python runtests.py []
+