AttributeError: 'module' object has no attribute 'register'

[angvp]

Seems that new versions of django-tagging changed their API, so now django-planet throws this except

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/home/angvp/virtualenvs/pyarweb/lib/python3.4/site-packages/django/core/management/__init__.py", line 354, in execute_from_command_line
    utility.execute()
  File "/home/angvp/virtualenvs/pyarweb/lib/python3.4/site-packages/django/core/management/__init__.py", line 328, in execute
    django.setup()
  File "/home/angvp/virtualenvs/pyarweb/lib/python3.4/site-packages/django/__init__.py", line 18, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/angvp/virtualenvs/pyarweb/lib/python3.4/site-packages/django/apps/registry.py", line 108, in populate
    app_config.import_models(all_models)
  File "/home/angvp/virtualenvs/pyarweb/lib/python3.4/site-packages/django/apps/config.py", line 198, in import_models
    self.models_module = import_module(models_module_name)
  File "/home/angvp/virtualenvs/pyarweb/lib/python3.4/importlib/__init__.py", line 109, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 2254, in _gcd_import
  File "<frozen importlib._bootstrap>", line 2237, in _find_and_load
  File "<frozen importlib._bootstrap>", line 2226, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 1200, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 1129, in _exec
  File "<frozen importlib._bootstrap>", line 1471, in exec_module
  File "<frozen importlib._bootstrap>", line 321, in _call_with_frames_removed
  File "/home/angvp/virtualenvs/pyarweb/lib/python3.4/site-packages/planet/models.py", line 292, in <module>
    tagging.register(Post)
AttributeError: 'module' object has no attribute 'register'

I'm working on a quick PR for handling different versions