Retrieve the media type settings for a application.

    :param tornado.web.Application application:
    :keyword bool force_instance: if :data:`True` then create the
        instance if it does not exist

    :return: the content settings instance
    :rtype: sprockets.mixins.mediatype.content.ContentSettings

def get_settings(application, force_instance=False):
    """
    Retrieve the media type settings for a application.

    :param tornado.web.Application application:
    :keyword bool force_instance: if :data:`True` then create the
        instance if it does not exist

    :return: the content settings instance
    :rtype: sprockets.mixins.mediatype.content.ContentSettings

    """
    try:
        return application.settings[SETTINGS_KEY]
    except KeyError:
        if not force_instance:
            return None
    return install(application, None)