Added uncertainties and coverage to tox testing.

tox.ini

@@ -1,24 +1,77 @@
 [tox]
-envlist = py26,py27,py32,py33,numpy26,numpy27,numpy32
+envlist = py26,py27,py32,py33,numpy26,numpy27,numpy32,numpy33,
+          py26u,py27u,py32u,py33u,numpy26u,numpy27u,numpy32u,numpy33u
 
 [testenv]
-commands = {envpython} setup.py test
+deps = coverage
+commands = coverage run -p --source=pint setup.py test
+
+setenv=
+    COVERAGE_FILE=.coverage.{envname}
+
 
 [testenv:py26]
 deps = unittest2
+       coverage
 
 [testenv:numpy26]
 deps = numpy
        unittest2
+       coverage
 
 [testenv:numpy27]
 basepython=python2.7
 deps = numpy
+       coverage
 
 [testenv:numpy32]
 basepython=python3.2
 deps = numpy
+       coverage
 
 [testenv:numpy33]
 basepython=python3.3
 deps = numpy
+       coverage
+
+
+[testenv:py26u]
+deps = unittest2
+       uncertainties
+       coverage
+
+[testenv:py27u]
+deps = uncertainties
+       coverage
+
+[testenv:py32u]
+deps = uncertainties
+       coverage
+
+[testenv:py33u]
+deps = uncertainties
+       coverage
+
+[testenv:numpy26u]
+deps = numpy
+       unittest2
+       uncertainties
+       coverage
+
+[testenv:numpy27u]
+basepython=python2.7
+deps = numpy
+       uncertainties
+       coverage
+
+[testenv:numpy32u]
+basepython=python3.2
+deps = numpy
+       uncertainties
+       coverage
+
+[testenv:numpy33u]
+basepython=python3.3
+deps = numpy
+       uncertainties
+       coverage