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

from django.core.management.base import AppCommand

class Command(AppCommand):
    help = "Prints the custom table modifying SQL statements for the given app name(s)."

    output_transaction = True

    def handle_app(self, app, **options):
        from django.core.management.sql import sql_custom
        return u'\n'.join(sql_custom(app, self.style)).encode('utf-8')