Support command-not-found on Arch Linux

Signed-off-by: Sorin Ionescu <sorin.ionescu@gmail.com>
Add Ocaml module

Manage local Ocaml modules with OPAM.

Signed-off-by: Sorin Ionescu <sorin.ionescu@gmail.com>
Add and update module descriptions
Merge commit '28e956691ca727ab4ae1bdbf73cc631a9f905527' into develop

Conflicts:
	modules/README.md