Set stylesheet for the given subreddit.

        :returns: The json response from the server.

def set_stylesheet(self, subreddit, stylesheet):
        """Set stylesheet for the given subreddit.

        :returns: The json response from the server.

        """
        subreddit = six.text_type(subreddit)
        data = {'r': subreddit,
                'stylesheet_contents': stylesheet,
                'op': 'save'}  # Options: save / preview
        self.evict(self.config['stylesheet'].format(subreddit=subreddit))
        return self.request_json(self.config['subreddit_css'], data=data)