Activate company mode support for merlin

Also, provide a commented out sample for activating autocomplete support

modules/prelude-ocaml.el

@@ -50,6 +50,13 @@
 (add-hook 'tuareg-mode-hook 'utop-setup-ocaml-buffer)
 (add-hook 'tuareg-mode-hook 'merlin-mode)
 
+;; Setup merlin completions company is used by default in prelude
+(add-to-list 'company-backends 'merlin-company-backend)
+
+;; But merlin also offers support for autocomplete, uncomment this next line
+;; to activate it.
+;; (setq merlin-use-auto-complete-mode t)
+
 (setq utop-command "opam config exec \"utop -emacs\""
       merlin-error-after-save nil)