Make TOX test against Python 3
Make travis test against Python 3
Use six.with_metaclass.
Use six.StringIO.
Use smart/force_text.
Use dict.items() instead of iteritems()
Use python_2_unicode_compatible.
Use six.string_types instead of basestring.
Avoid using unicode().
Avoid using ugettext_lazy.
Make sure to write bytes to files.
Avoid sorting str with None.
Fixed a deprecation warning.
Updated package classifiers.
Merge pull request #30 from charettes/python-3

Added Python 3 support