Test across supported pythons with tox.
Unused import.
Unused import.
Py3k:  avoid 'basestring'.
Coverage
Coverage for d.w.DateTimeInputWidget.
Coverage for d.w.ChosenOptGroupWidget.
Coverage for d.w.ChosenMultipleWidget.
Wrap long lines.
Don't need separate cover part.
Coverage under Python2.
Merge pull request #55 from tseaver/py3

Py3k compatibility + test coverage