Use py35 as preferred py3 interpreter for special test environments

tox.ini

@@ -3,7 +3,7 @@ minversion=2.0
 distshare={homedir}/.tox/distshare
 envlist=
      flakes,py26,py27,py33,py34,py35,pypy,
-     {py27,py34}-{pexpect,xdist,trial},
+     {py27,py35}-{pexpect,xdist,trial},
      py27-nobyte,doctesting,py27-cxfreeze
 
 [testenv]
@@ -43,7 +43,7 @@ deps=pytest-xdist>=1.13
 commands=
   py.test -n1 -rfsxX {posargs:testing}
 
-[testenv:py34-xdist]
+[testenv:py35-xdist]
 deps={[testenv:py27-xdist]deps}
 commands=
   py.test -n3 -rfsxX {posargs:testing}
@@ -55,7 +55,7 @@ deps=pexpect
 commands=
   py.test -rfsxX test_pdb.py test_terminal.py test_unittest.py
 
-[testenv:py34-pexpect]
+[testenv:py35-pexpect]
 changedir=testing
 platform=linux|darwin
 deps={[testenv:py27-pexpect]deps}
@@ -75,8 +75,7 @@ deps=twisted
 commands=
   py.test -rsxf {posargs:testing/test_unittest.py}
 
-[testenv:py34-trial]
-# py34-trial does not work
+[testenv:py35-trial]
 platform=linux|darwin
 deps={[testenv:py27-trial]deps}
 commands=