Support Python3

[Nekmo]

According to the setup.py, this module is not compatible with python3. Please Included python3 the support. Thank you very much.

tox.ini
-------
[tox]
envlist =
    pep8
    py27-dj19-cms32
    py27-dj18-cms{32,31}
    py27-dj17-cms{32,31,30}
    py{27,26}-dj16-cms{31,30}
    py{27,26}-dj15-cms30

.travis.yml
-----------
env:
  - TOX_ENV=pep8
  - TOX_ENV=py27-dj19-cms32
  - TOX_ENV=py27-dj18-cms32
  - TOX_ENV=py27-dj18-cms31
  - TOX_ENV=py27-dj17-cms32
  - TOX_ENV=py27-dj17-cms31
  - TOX_ENV=py27-dj17-cms30
  - TOX_ENV=py27-dj16-cms31
  - TOX_ENV=py27-dj16-cms30
  - TOX_ENV=py26-dj16-cms31
  - TOX_ENV=py26-dj16-cms30
  - TOX_ENV=py27-dj15-cms30
  - TOX_ENV=py26-dj15-cms30

setup.py
--------
     ...
    classifiers=[
        'Development Status :: 4 - Beta',
        'Framework :: Django',
        'Intended Audience :: Developers',
        'License :: OSI Approved :: BSD License',
        'Operating System :: OS Independent',
        'Programming Language :: Python',
        'Topic :: Internet :: WWW/HTTP',
        'Programming Language :: Python :: 2.6',
        'Programming Language :: Python :: 2.7',
    ],