Add a little command-line tool for running tests, plus tox support

Tox is a handy little tool to make it easier than not to run proper
tests that exercise the build system and are run against multiple
Python versions: http://pypi.python.org/pypi/tox
See comment at the top of tox.ini for hints.

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+# 'Tox' is a tool for automating sdist/build/test cycles against
+# multiple Python versions:
+#   http://pypi.python.org/pypi/tox
+#   http://tox.testrun.org/
+
+# Running the command 'tox' while in the root of the numpy source
+# directory will:
+#   - Create a numpy source distribution (setup.py sdist)
+#   - Then for every supported version of Python:
+#     - Create a virtualenv in .tox/py$VERSION and install
+#       dependencies. (These virtualenvs are cached across runs unless
+#       you use --recreate.)
+#     - Use pip to install the numpy sdist into the virtualenv
+#     - Run the numpy tests
+# To run against a specific subset of Python versions, use:
+#   tox -e py24,py27
+
+# Extra arguments will be passed to test-installed-numpy.py. To run
+# the full testsuite:
+#   tox full
+# To run with extra verbosity:
+#   tox -- -v
+
+# Tox assumes that you have appropriate Python interpreters already
+# installed and that they can be run as 'python2.4', 'python2.5', etc.
+
+[tox]
+envlist = py24,py25,py26,py27,py31,py32
+
+[testenv]
+deps=
+  nose
+changedir={envdir}
+commands=python {toxinidir}/tools/test-installed-numpy.py {posargs:}
+
+# Not run by default. Set up the way you want then use 'tox -e debug'
+# if you want it:
+[testenv:debug]
+basepython=PYTHON-WITH-DEBUG-INFO
+commands=gdb --args {envpython} {toxinidir}/tools/test-installed-numpy.py {posargs:}