Create a truly portable jengaboot.

[jordwalke]

Here's my proposal:

Create a fork of jenga, but instead of using ocaml_plugin, just compile in jengaroot rules statically. Then we can compile all of jenga + our custom rules into a single portable bytecode file that we can check into npm and onto CI hosts.

(We need to compile in the rules statically instead of using ocaml plugin because ocaml plugin doesn't work when jenga is compiled as byte code).

[vramana]

This issue can be closed. cc @chenglou