Get TravisCI working again

Python 2.6 is EOL since long time ago and fully unsupported.
In the meantime Python 3.6 was released.

Author: besser82

.travis.yml

@@ -1,24 +1,26 @@
-env:
-- TOXENV=py34
-- TOXENV=py33
-- TOXENV=py27
-- TOXENV=py26
-- TOXENV=pypy
-
-install: pip install -U tox
-
 language: python
 
+cache:
+  directories:
+    - .tox
+    - $HOME/.cache/pip
+
 matrix:
   include:
+    - python: 2.7
+      env: TOXENV=py27
+    - python: 3.3
+      env: TOXENV=py33
+    - python: 3.4
+      env: TOXENV=py34
     - python: 3.5
       env: TOXENV=py35
+    - python: 3.6
+      env: TOXENV=py36
+
+install: pip install -U tox
 
 script: tox
-cache:
-  directories:
-    - .tox
-    - $HOME/.cache/pip
 
 deploy:
   provider: pypi

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py26, py27, py33, py34, py35
+envlist = py27, py33, py34, py35, py36
 
 [testenv]
 deps =