Some modernization of the test running

.gitignore

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+# This file is generated by Cython
+ext/_yaml.c
+
+# Tox and Build Artifacts
+.tox/
+MANIFEST
+build/
+
+# Python runtime Artifacts
+*.pyc

.travis.yml

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+language: python
+
+sudo: false
+
+cache:
+    directories:
+        - $HOME/.cache/pip
+
+matrix:
+  include:
+    - python: 2.6
+      env: TOXENV=py26
+    - 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: pypy
+      env: TOXENV=pypy PYPY_VERSION=5.1
+
+install:
+    - ./.travis/install.sh
+
+script:
+  - tox

.travis/install.sh

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+# temporary pyenv installation to get latest pypy until the travis
+# container infra is upgraded
+if [[ "${TOXENV}" = pypy* ]]; then
+    git clone https://github.com/yyuu/pyenv.git ~/.pyenv
+    PYENV_ROOT="$HOME/.pyenv"
+    PATH="$PYENV_ROOT/bin:$PATH"
+    eval "$(pyenv init -)"
+    pyenv install "pypy-$PYPY_VERSION"
+    pyenv global "pypy-$PYPY_VERSION"
+
+    pip install --upgrade tox
+
+    pyenv rehash
+fi
+
+
+pip install --upgrade tox

tox.ini

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+[tox]
+envlist = py26,py27,pypy,py33,py34,py35,
+
+[testenv]
+deps =
+    Cython
+commands =
+    python setup.py test