ci: tox (#242)

* Add tox
* Run flake only on Python3.6

Author: heliomeiralins

.gitignore

@@ -5,3 +5,6 @@ neovim/ui/screen.so
 build/
 dist/
 *.pyc
+.cache
+.eggs
+.tox

.travis.yml

@@ -10,9 +10,7 @@ env:
     - CI_TARGET=tests
 matrix:
   include:
-    - python: 2.7
-      env: CI_TARGET=flake
-    - python: 3.4
+    - python: 3.6
       env: CI_TARGET=flake
 python:
   # If the build matrix gets bigger, also update the number of runs
@@ -21,19 +19,20 @@ python:
   - 3.3
   - 3.4
   - 3.5
+  - 3.6
   - pypy
 before_install:
   - if [ $CI_TARGET = tests ]; then
       eval "$(curl -Ss https://raw.githubusercontent.com/neovim/bot-ci/master/scripts/travis-setup.sh) nightly-x64";
-      pip install -q scrutinizer-ocular;
+      pip install -q scrutinizer-ocular tox-travis;
     else
       pip install -q flake8 flake8-import-order flake8-docstrings pep8-naming;
     fi
 install:
   - pip install .
 script:
   - if [ $CI_TARGET = tests ]; then
-      nosetests;
+      tox;
     else
       flake8 neovim;
     fi

tox.ini

@@ -0,0 +1,7 @@
+[tox]
+envlist = py{27,33,34,35,36}-{asyncio,pyuv},pypy
+[testenv]
+deps=
+  nose
+  pyuv: pyuv
+commands=nosetests