Remove py34 tox env and pypi classifier

Currently only py27 and py35 (not py34) is tested in the gate, so
py34 should no longer be part of the tox environment or part of the
PyPi classifier.

Change-Id: I155fc0e3ac06b495718d9fa3058edded738cb011

Author: ericwb

setup.cfg

@@ -16,7 +16,6 @@ classifier =
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.4
     Programming Language :: Python :: 3.5
 
 [files]

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 1.6
-envlist = py35,py34,py27,pep8
+envlist = py35,py27,pep8
 skipdist = True
 
 [testenv]