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

tox.ini

@@ -0,0 +1,19 b''
+# 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, py32
+
+[testenv]
+commands =
+    pip install -q --use-mirrors numpy nose
+    easy_install -q pyzmq
+    iptest -w /tmp
+
+[testenv:py32]
+commands =
+    pip install -q --use-mirrors numpy nose
+    easy_install -q pyzmq
+    iptest3 -w /tmp