Use tox-travis to simplify the whole thing

.travis.yml

@@ -1,15 +1,9 @@
 language: python
-before_script:
-  - pyenv global $TRAVIS_PYTHON_VERSION
 script: tox
-before_install:
-  - pyenv global system 3.5
-  - export PATH=$PYENV_ROOT/bin:$PATH
 install:
-  - pip install tox
-env:
-  - TOXENV=py27
-  - TOXENV=py34
-  - TOXENV=py35
-  - TOXENV=py36
-  - TOXENV=docs
+  - pip install tox-travis
+python:
+  - "2.7"
+  - "3.4"
+  - "3.5"
+  - "3.6"

tox.ini

@@ -26,3 +26,10 @@ deps =
 [flake8]
 exclude = migrations
 max_line_length = 100
+
+[travis]
+python =
+  2.7: py27
+  3.4: py34
+  3.5: py35
+  3.6: py36, docs, lint