Add support for testing supported versions via Tox.

.gitignore

@@ -12,3 +12,6 @@ parts
 eggs
 *.egg-info
 develop-eggs
+.coverage
+nosetests.xml
+.tox/

tox.ini

+[tox]
+envlist =
+#   py26,py27,py27-pure,py32,py33,py34,pypy,pypy3,coverage
+    py26,py27,coverage
+
+[testenv]
+commands =
+    nosetests --doctest-tests --where={envsitepackagesdir}/Acquisition
+deps =
+    nose
+
+[testenv:py27-pure]
+basepython =
+    python2.7
+setenv =
+    PURE_PYTHON = 1
+
+[testenv:coverage]
+basepython =
+    python2.7
+commands =
+    nosetests --with-xunit --with-xcoverage --doctest-tests --where={envsitepackagesdir}/Acquisition --cover-package=Acquisition
+deps =
+    nose
+    coverage
+    nosexcover
+#setenv =
+#    PURE_PYTHON = 1