Add python 3.5 in classifier and envlist

Now we can support py35 in classifier,and add the convenience
py35 env.

Change-Id: I98ac5543d995dca021fc3aff3993dc07fb2c4b7a

setup.cfg

@@ -17,7 +17,7 @@ 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]
 packages =

tox.ini

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