[.] Separate rtop repo/package.
[x] created repo: https://github.com/reasonml/rtop
[ ] Move rtop portion there.
[x] Compare old .install file to new one to make sure we're not missing anything.
[x] Need to create an (install) section for the myocamlbuild and rtop_init.ml
[ ] Re-enable the js test that was disabled on old node.
[ ] The trace flag for menhir compilation (can be done in a follow up diff).