Enable py33 test

Author: dittos

.travis.yml

@@ -2,6 +2,7 @@ language: python
 sudo: false
 python:
 - 2.7
+- 3.3
 - 3.4
 install:
 - pip install pytest pytest-cov coveralls flake8

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = flake8,py27,py34,docs
+envlist = flake8,py27,py33,py34,docs
 
 [testenv]
 deps = pytest>=2.7.2