Syntax highlighting: add support for "external" definitions.
Syntax highlighting: add rules for class/object.
Tutorial: syntax highlight some.
Syntax highlight optional arguments of functions.
Code: capture stderr output.
Tutorial: syntax highlight "Common error messages".
Merge branch 'master' of github.com:ocaml/ocaml.org
add/fix links to Consortium
Merge remote-tracking branch 'origin/master'