Add tox.ini for easy multiple python version testing

Author: techniq

tox.ini

@@ -0,0 +1,13 @@
+# 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]
+envlist = py26, py27
+
+[testenv]
+deps = nose
+commands = pip install -r requirements.txt --use-mirrors
+           nosetests
+