         * sanitize     (bool)   : false  - when set to true, the headers will be stripped of any HTML in the TOC
            * class        (string) :   ''   - a CSS class assigned to the TOC
            * id           (string) :   ''   - an ID to assigned to the TOC
            * h_min        (int)    :   1    - the minimum TOC header level to use; any header lower than this value will be ignored
            * h_max        (int)    :   6    - the maximum TOC header level to use; any header greater than th