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

.gitignore

@@ -1 +1,2 @@
 *.pyc
+.tox

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, pypy
+
+[testenv]
+commands =
+    python test.py
+deps =
+    PyYAML