Add back tox

src/tox.ini

@@ -0,0 +1,22 @@
+# Tox (http://tox.testrun.org/) is a tool for running tests
+# in multiple virtualenvs. This configuration file will run the
+# test suite on all supported python versions. To use it, "pip install tox"
+# and then run "tox" from this directory.
+
+[tox]
+skipsdist = True
+envlist = py34, py35, py36, pycodestyle
+
+[testenv]
+commands = pytest
+deps = -r{toxinidir}/../requirements.txt
+
+[testenv:pycodestyle]
+commands=pycodestyle
+deps=pycodestyle
+
+[pycodestyle]
+exclude=
+  .tox,
+  migrations,
+  paperless/settings.py