Have tuareg mode set the compile command

to utilize corebuild via opam
Improve ocaml module documentation

Add some documentation about environment assumptions, and correct some
grammar issues.
Merge pull request #724 from RadicalZephyr/ocaml

Ocaml improvements
Remove custom erc notifications code

It should be replaced with the use of something like
https://github.com/jwiegley/alert
Merge branch 'master' of https://github.com/bbatsov/prelude