added tox.ini, thanks Marc

tox.ini

@@ -0,0 +1,11 @@
+# Tox (http://codespeak.net/~hpk/tox/) 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, pypy
+
+[testenv]
+commands = unit2 -v gluon.tests
+deps = unittest2