Add tests for importing backported stdlib modules from Py3.3
Add tests for importing backported stdlib modules from Py3.3

PythonCharmers/python-future,PythonCharmers/python-future,krischer/python-future,QuLogic/python-future,michaelpacer/python-future,krischer/python-future,QuLogic/python-future,michaelpacer/python-future