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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"Dummy cache backend"

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from django.core.cache.backends.base import BaseCache

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class CacheClass(BaseCache):

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    def __init__(self, *args, **kwargs):

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        pass

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    def add(self, *args, **kwargs):

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        return True

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    def get(self, key, default=None):

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        return default

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    def set(self, *args, **kwargs):

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        pass

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    def delete(self, *args, **kwargs):

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        pass

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    def get_many(self, *args, **kwargs):

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        return {}

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    def has_key(self, *args, **kwargs):

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        return False