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* Made ``CommentSecurityForm`` pass keyword arguments to its parent class.
* Added ``COMMENTS_TIMEOUT`` setting to configure the timeout for
``CommentSecurityForm``.
* Migrated ``Comment.user_email`` to 254 characters.
* Moved South migrations to ``south_migrations`` folder so they can exist with
Django 1.7 migrations.
* Added Django 1.9 compatibility, dropped support for Django 1.5.