iocaml.0.4.6 for ocaml.4.02.0
iocamljs needs optcomp as well
iocaml-kernel needs lwt
constrain old iocaml for 4.00.1 to work round ocp-build/index problems
make compatible with 4.00.1
fix ctrl+m not working on chromium
Merge pull request #2549 from andrewray/iocaml.0.4.6

iocaml.0.4.6 for ocaml.4.02.0, js_of_ocaml.2.4.1