Tags method in client handler now return a list of tags.

        for obj in objects:

            if 'a' not in obj:

                raise BadObjectError('All objects must have the "a" tag.')

        tags = {}

        tags = []

        for obj in objects:

            tags[obj['a']] = self._server.conf.show(obj['a'])['tags']

            otags = self._server.conf.show(obj['a'])['tags']

            otags.update({'id': obj['id']})

            tags.append(otags)

        return tags

    @listed