Add support for tox (http://tox.testrun.org/)

Author: msabramo

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 = py25, py26, py27
+
+[testenv]
+commands =
+    {envpython} setup.py clean
+    {envpython} setup.py install
+    {envpython} selftest.py