erin.el can be downloaded at http://www.neilvandyke.org/erin-twiki-emacs
(require 'erin)
(add-hook 'erin-mode-hook
(lambda()
(interactive)
(outline-minor-mode 1)
(make-local-variable 'outline-regexp)
(setq outline-regexp "---\*+")
;; customize the bindings yourself
(local-set-key "\C-c\C-q" 'hide-sublevels)
(local-set-key "\C-c\C-a" 'show-all)
(local-set-key "\C-c\C-t" 'hide-body)
(local-set-key "\C-c\C-s" 'outline-toggle-children)))