removing pexpect from general dependencies because

it doesn't install on windows anymore.  Instead
to specific configurations for pexpect on py27 and py33
which only call the tests that need it.

tox.ini

@@ -1,12 +1,11 @@
 [tox]
 distshare={homedir}/.tox/distshare
-envlist=flakes,py25,py26,py27,pypy,py27-nobyte,py32,py33,py27-xdist,py33-xdist,trial
+envlist=flakes,py25,py26,py27,pypy,py27-pexpect,py33-pexpect,py27-nobyte,py32,py33,py27-xdist,py33-xdist,trial
 
 [testenv]
 changedir=testing
 commands= py.test --lsof -rfsxX --junitxml={envlogdir}/junit-{envname}.xml []
 deps=
-    pexpect
     nose
 
 [testenv:genscript]
@@ -41,6 +40,20 @@ commands=
   py.test -n3 -rfsxX \
         --junitxml={envlogdir}/junit-{envname}.xml testing
 
+[testenv:py27-pexpect]
+changedir=testing
+basepython=python2.7
+deps=pexpect
+commands=
+  py.test -rfsxX test_pdb.py test_terminal.py test_unittest.py
+
+[testenv:py33-pexpect]
+changedir=testing
+basepython=python2.7
+deps={[testenv:py27-pexpect]deps}
+commands=
+  py.test -rfsxX test_pdb.py test_terminal.py test_unittest.py
+
 [testenv:py27-nobyte]
 changedir=.
 basepython=python2.7
@@ -55,7 +68,6 @@ commands=
 [testenv:trial]
 changedir=.
 deps=twisted
-     pexpect
 commands=
   py.test -rsxf \
         --junitxml={envlogdir}/junit-{envname}.xml {posargs:testing/test_unittest.py}