tox: Add tox config file

This allows for testing across multiple environments, including Python 3 in
the not too distant future. The instant bonus is that this allows for testing
the docs build at Travis so I don't make more releases like 0.18.2 with broken
docs.

.gitignore

@@ -1,6 +1,8 @@
 *.egg-info
+*.orig
 *.pyc
 *.swp
+*~
 .coverage
 .idea
 .noseids
@@ -11,9 +13,8 @@ cover/
 coverage.xml
 dist/
 docs/_build/
+js/test/lib/
 mopidy.log*
 node_modules/
 nosetests.xml
-*~
-*.orig
-js/test/lib/
+xunit-*.xml

tox.ini

@@ -0,0 +1,19 @@
+[tox]
+envlist = py27, docs, flake8
+
+[testenv]
+sitepackages = true
+deps =
+    coverage
+    mock
+    nose
+commands = nosetests -v --with-xunit --xunit-file=xunit-{envname}.xml --with-coverage --cover-package=mopidy
+
+[testenv:docs]
+deps = -r{toxinidir}/docs/requirements.txt
+changedir = docs
+commands = sphinx-build -b html -d {envtmpdir}/doctrees . {envtmpdir}/html
+
+[testenv:flake8]
+deps = flake8
+commands = flake8 docs/ fabfile.py mopidy/ setup.py tests/