tox.ini: add Tox configuration file, with py27, py35, coverage and coveralls environments

tox.ini

@@ -0,0 +1,33 @@
+[tox]
+envlist = py27, py35
+
+[testenv]
+deps =
+    pytest
+    -rrequirements.txt
+commands =
+    # run the test suite against the package installed inside tox env
+    py.test {posargs:--pyargs cu2qu}
+
+[testenv:coverage]
+basepython = {env:TOXPYTHON:python3.5}
+deps =
+    {[testenv]deps}
+    pytest-cov
+skip_install = true
+commands=
+    # measure test coverage and create html report
+    py.test --cov --cov-report html {posargs}
+
+[testenv:coveralls]
+passenv = TRAVIS TRAVIS_JOB_ID TRAVIS_BRANCH
+basepython=python3.5
+deps =
+    {[testenv:coverage]deps}
+    coveralls
+skip_install = true
+ignore_outcome = true
+commands=
+    # measure test coverage and upload report to coveralls
+    py.test --cov
+    coveralls