- Added Travis CI.

.travis.yml

+---
+language: python
+python: ["2.7", "3.2", "3.3", "3.4", "3.5"]
+dist: trusty
+sudo: false
+cache:
+  - pip
+
+install:
+    - pip install tox-travis
+
+script:
+  - tox
+
+notifications:
+  email: false

tox.ini

 [tox]
 envlist = py{2,3}
 
+[travis]
+python =
+    2.7: py2
+    3.2: py3
+    3.3: py3
+    3.4: py3
+    3.5: py3
+
 [testenv]
 basepython =
     py2: python2