File Release Notes and Changelog

Fixes bugs:
• install from makefile in tarball of tuareg 2.0.2 fails at version detection
https://forge.ocamlcore.org/tracker/index.php?func=detail&aid=760&group_id=43&atid=255
• Stack overflow in regexp matcher (tuareg-caml-mode.tar.gz)
http://caml.inria.fr/mantis/view.php?id=5176
• caml-types-explore does not work (tuareg-caml-mode.tar.gz)
http://caml.inria.fr/mantis/view.php?id=5137