Add Python 3.5 env for tox and Travis CI

Author: redapple

.travis.yml

@@ -1,11 +1,12 @@
 language: python
-python: 2.7
+python: 3.5
 sudo: false
 env:
   - TOXENV=py27
   - TOXENV=pypy
   - TOXENV=py33
   - TOXENV=py34
+  - TOXENV=py35
 
 install:
   - pip install -U tox twine wheel codecov

tox.ini

@@ -4,7 +4,7 @@
 # and then run "tox" from this directory.
 
 [tox]
-envlist = py27, pypy, py33, py34
+envlist = py27, pypy, py33, py34, py35
 
 [testenv]
 deps =