Adds to Melange a tags framework based on taggable-mixin. The taggable-mixin allowed only tag per Datastore model. This is extended framework allows any arbitrary number of tags per Datastore model. Also, now one can define different models for different Tag types which are all inherited from the base Tag model provided by taggable-mixin. The GHOPTask model makes use of 2 tags per model, one for difficulty and the other for task_type, both using the tags framework. Reviewed by: Paweł Sołyga

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"""

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>>> from django.contrib.sites.models import Site

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>>> from django.conf import settings

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>>> Site(id=settings.SITE_ID, domain="example.com", name="example.com").save()

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>>> # Make sure that get_current() does not return a deleted Site object.

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>>> s = Site.objects.get_current()

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>>> isinstance(s, Site)

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True

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>>> s.delete()

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>>> Site.objects.get_current()

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Traceback (most recent call last):

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...

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DoesNotExist: Site matching query does not exist.

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"""