Add Ocaml module

Manage local Ocaml modules with OPAM

modules/ocaml/README.md

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+Ocaml
+=====
+
+Configures [Ocaml][1] package management.
+
+OPAM
+----
+
+[OPAM][2] is a package manager for Ocaml.
+
+This module enables local package installation with OPAM, by extending the
+relevant path and Ocaml variables.
+
+### Usage
+
+Install packages to your local package directory with `opam install`.
+
+Authors
+-------
+
+*The authors of this module should be contacted via the [issue tracker][3].*
+
+  - [Sorin Ionescu](https://github.com/sorin-ionescu)
+  - [Sebastian Wiesner](https://github.com/lunaryorn)
+
+
+[1]: http://ocaml.org/
+[2]: http://opam.ocamlpro.com/
+[3]: https://github.com/sorin-ionescu/prezto/issues

modules/ocaml/init.zsh

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+#
+# Configures Ocaml package management
+#
+# Authors: Sebastian Wiesner <lunaryorn@gmail.com>
+#
+
+if (( ! $+commands[opam] )); then
+  return 1
+fi
+
+eval `opam config env`