Restore testing against Python 3.4 and 3.5

Author: davehunt

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py{27,36,py,py3}, flake8
+envlist = py{27,34,35,36,py,py3}, flake8
 
 [testenv]
 commands = pytest -v -r a {posargs}